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<?php
/**
* API for easily embedding rich media such as videos and images into content.
*
* @package WordPress
* @subpackage Embed
* @since 2.9.0
*/
class WP_Embed {
public $handlers = array();
public $post_ID;
public $usecache = true;
public $linkifunknown = true;
public $last_attr = array();
public $last_url = '';
/**
* When a URL cannot be embedded, return false instead of returning a link
* or the URL.
*
* Bypasses the {@see 'embed_maybe_make_link'} filter.
*
* @var bool
*/
public $return_false_on_fail = false;
/**
* Constructor
*/
public function __construct() {
// Hack to get the [embed] shortcode to run before wpautop()
add_filter( 'the_content', array( $this, 'run_shortcode' ), 8 );
add_filter( 'widget_text_content', array( $this, 'run_shortcode' ), 8 );
// Shortcode placeholder for strip_shortcodes()
add_shortcode( 'embed', '__return_false' );
// Attempts to embed all URLs in a post
add_filter( 'the_content', array( $this, 'autoembed' ), 8 );
add_filter( 'widget_text_content', array( $this, 'autoembed' ), 8 );
// After a post is saved, cache oEmbed items via Ajax
add_action( 'edit_form_advanced', array( $this, 'maybe_run_ajax_cache' ) );
add_action( 'edit_page_form', array( $this, 'maybe_run_ajax_cache' ) );
}
/**
* Process the [embed] shortcode.
*
* Since the [embed] shortcode needs to be run earlier than other shortcodes,
* this function removes all existing shortcodes, registers the [embed] shortcode,
* calls do_shortcode(), and then re-registers the old shortcodes.
*
* @global array $shortcode_tags
*
* @param string $content Content to parse
* @return string Content with shortcode parsed
*/
public function run_shortcode( $content ) {
global $shortcode_tags;
// Back up current registered shortcodes and clear them all out
$orig_shortcode_tags = $shortcode_tags;
remove_all_shortcodes();
add_shortcode( 'embed', array( $this, 'shortcode' ) );
// Do the shortcode (only the [embed] one is registered)
$content = do_shortcode( $content, true );
// Put the original shortcodes back
$shortcode_tags = $orig_shortcode_tags;
return $content;
}
/**
* If a post/page was saved, then output JavaScript to make
* an Ajax request that will call WP_Embed::cache_oembed().
*/
public function maybe_run_ajax_cache() {
$post = get_post();
if ( ! $post || empty( $_GET['message'] ) ) {
return;
}
?>
<script type="text/javascript">
jQuery(document).ready(function($){
$.get("<?php echo admin_url( 'admin-ajax.php?action=oembed-cache&post=' . $post->ID, 'relative' ); ?>");
});
</script>
<?php
}
/**
* Registers an embed handler.
*
* Do not use this function directly, use wp_embed_register_handler() instead.
*
* This function should probably also only be used for sites that do not support oEmbed.
*
* @param string $id An internal ID/name for the handler. Needs to be unique.
* @param string $regex The regex that will be used to see if this handler should be used for a URL.
* @param callable $callback The callback function that will be called if the regex is matched.
* @param int $priority Optional. Used to specify the order in which the registered handlers will be tested (default: 10). Lower numbers correspond with earlier testing, and handlers with the same priority are tested in the order in which they were added to the action.
*/
public function register_handler( $id, $regex, $callback, $priority = 10 ) {
$this->handlers[ $priority ][ $id ] = array(
'regex' => $regex,
'callback' => $callback,
);
}
/**
* Unregisters a previously-registered embed handler.
*
* Do not use this function directly, use wp_embed_unregister_handler() instead.
*
* @param string $id The handler ID that should be removed.
* @param int $priority Optional. The priority of the handler to be removed (default: 10).
*/
public function unregister_handler( $id, $priority = 10 ) {
unset( $this->handlers[ $priority ][ $id ] );
}
/**
* The do_shortcode() callback function.
*
* Attempts to convert a URL into embed HTML. Starts by checking the URL against the regex of
* the registered embed handlers. If none of the regex matches and it's enabled, then the URL
* will be given to the WP_oEmbed class.
*
* @param array $attr {
* Shortcode attributes. Optional.
*
* @type int $width Width of the embed in pixels.
* @type int $height Height of the embed in pixels.
* }
* @param string $url The URL attempting to be embedded.
* @return string|false The embed HTML on success, otherwise the original URL.
* `->maybe_make_link()` can return false on failure.
*/
public function shortcode( $attr, $url = '' ) {
$post = get_post();
if ( empty( $url ) && ! empty( $attr['src'] ) ) {
$url = $attr['src'];
}
$this->last_url = $url;
if ( empty( $url ) ) {
$this->last_attr = $attr;
return '';
}
$rawattr = $attr;
$attr = wp_parse_args( $attr, wp_embed_defaults( $url ) );
$this->last_attr = $attr;
// kses converts & into & and we need to undo this
// See https://core.trac.wordpress.org/ticket/11311
$url = str_replace( '&', '&', $url );
// Look for known internal handlers
ksort( $this->handlers );
foreach ( $this->handlers as $priority => $handlers ) {
foreach ( $handlers as $id => $handler ) {
if ( preg_match( $handler['regex'], $url, $matches ) && is_callable( $handler['callback'] ) ) {
if ( false !== $return = call_user_func( $handler['callback'], $matches, $attr, $url, $rawattr ) ) {
/**
* Filters the returned embed handler.
*
* @since 2.9.0
*
* @see WP_Embed::shortcode()
*
* @param mixed $return The shortcode callback function to call.
* @param string $url The attempted embed URL.
* @param array $attr An array of shortcode attributes.
*/
return apply_filters( 'embed_handler_html', $return, $url, $attr );
}
}
}
}
$post_ID = ( ! empty( $post->ID ) ) ? $post->ID : null;
// Potentially set by WP_Embed::cache_oembed().
if ( ! empty( $this->post_ID ) ) {
$post_ID = $this->post_ID;
}
// Check for a cached result (stored as custom post or in the post meta).
$key_suffix = md5( $url . serialize( $attr ) );
$cachekey = '_oembed_' . $key_suffix;
$cachekey_time = '_oembed_time_' . $key_suffix;
/**
* Filters the oEmbed TTL value (time to live).
*
* @since 4.0.0
*
* @param int $time Time to live (in seconds).
* @param string $url The attempted embed URL.
* @param array $attr An array of shortcode attributes.
* @param int $post_ID Post ID.
*/
$ttl = apply_filters( 'oembed_ttl', DAY_IN_SECONDS, $url, $attr, $post_ID );
$cache = '';
$cache_time = 0;
$cached_post_id = $this->find_oembed_post_id( $key_suffix );
if ( $post_ID ) {
$cache = get_post_meta( $post_ID, $cachekey, true );
$cache_time = get_post_meta( $post_ID, $cachekey_time, true );
if ( ! $cache_time ) {
$cache_time = 0;
}
} elseif ( $cached_post_id ) {
$cached_post = get_post( $cached_post_id );
$cache = $cached_post->post_content;
$cache_time = strtotime( $cached_post->post_modified_gmt );
}
$cached_recently = ( time() - $cache_time ) < $ttl;
if ( $this->usecache || $cached_recently ) {
// Failures are cached. Serve one if we're using the cache.
if ( '{{unknown}}' === $cache ) {
return $this->maybe_make_link( $url );
}
if ( ! empty( $cache ) ) {
/**
* Filters the cached oEmbed HTML.
*
* @since 2.9.0
*
* @see WP_Embed::shortcode()
*
* @param mixed $cache The cached HTML result, stored in post meta.
* @param string $url The attempted embed URL.
* @param array $attr An array of shortcode attributes.
* @param int $post_ID Post ID.
*/
return apply_filters( 'embed_oembed_html', $cache, $url, $attr, $post_ID );
}
}
/**
* Filters whether to inspect the given URL for discoverable link tags.
*
* @since 2.9.0
* @since 4.4.0 The default value changed to true.
*
* @see WP_oEmbed::discover()
*
* @param bool $enable Whether to enable `<link>` tag discovery. Default true.
*/
$attr['discover'] = apply_filters( 'embed_oembed_discover', true );
// Use oEmbed to get the HTML.
$html = wp_oembed_get( $url, $attr );
if ( $post_ID ) {
if ( $html ) {
update_post_meta( $post_ID, $cachekey, $html );
update_post_meta( $post_ID, $cachekey_time, time() );
} elseif ( ! $cache ) {
update_post_meta( $post_ID, $cachekey, '{{unknown}}' );
}
} else {
$has_kses = false !== has_filter( 'content_save_pre', 'wp_filter_post_kses' );
if ( $has_kses ) {
// Prevent KSES from corrupting JSON in post_content.
kses_remove_filters();
}
$insert_post_args = array(
'post_name' => $key_suffix,
'post_status' => 'publish',
'post_type' => 'oembed_cache',
);
if ( $html ) {
if ( $cached_post_id ) {
wp_update_post(
wp_slash(
array(
'ID' => $cached_post_id,
'post_content' => $html,
)
)
);
} else {
wp_insert_post(
wp_slash(
array_merge(
$insert_post_args,
array(
'post_content' => $html,
)
)
)
);
}
} elseif ( ! $cache ) {
wp_insert_post(
wp_slash(
array_merge(
$insert_post_args,
array(
'post_content' => '{{unknown}}',
)
)
)
);
}
if ( $has_kses ) {
kses_init_filters();
}
}
// If there was a result, return it.
if ( $html ) {
/** This filter is documented in site-inc/class-wp-embed.php */
return apply_filters( 'embed_oembed_html', $html, $url, $attr, $post_ID );
}
// Still unknown
return $this->maybe_make_link( $url );
}
/**
* Delete all oEmbed caches. Unused by core as of 4.0.0.
*
* @param int $post_ID Post ID to delete the caches for.
*/
public function delete_oembed_caches( $post_ID ) {
$post_metas = get_post_custom_keys( $post_ID );
if ( empty( $post_metas ) ) {
return;
}
foreach ( $post_metas as $post_meta_key ) {
if ( '_oembed_' == substr( $post_meta_key, 0, 8 ) ) {
delete_post_meta( $post_ID, $post_meta_key );
}
}
}
/**
* Triggers a caching of all oEmbed results.
*
* @param int $post_ID Post ID to do the caching for.
*/
public function cache_oembed( $post_ID ) {
$post = get_post( $post_ID );
$post_types = get_post_types( array( 'show_ui' => true ) );
/**
* Filters the array of post types to cache oEmbed results for.
*
* @since 2.9.0
*
* @param string[] $post_types Array of post type names to cache oEmbed results for. Defaults to post types with `show_ui` set to true.
*/
if ( empty( $post->ID ) || ! in_array( $post->post_type, apply_filters( 'embed_cache_oembed_types', $post_types ) ) ) {
return;
}
// Trigger a caching
if ( ! empty( $post->post_content ) ) {
$this->post_ID = $post->ID;
$this->usecache = false;
$content = $this->run_shortcode( $post->post_content );
$this->autoembed( $content );
$this->usecache = true;
}
}
/**
* Passes any unlinked URLs that are on their own line to WP_Embed::shortcode() for potential embedding.
*
* @see WP_Embed::autoembed_callback()
*
* @param string $content The content to be searched.
* @return string Potentially modified $content.
*/
public function autoembed( $content ) {
// Replace line breaks from all HTML elements with placeholders.
$content = wp_replace_in_html_tags( $content, array( "\n" => '<!-- wp-line-break -->' ) );
if ( preg_match( '#(^|\s|>)https?://#i', $content ) ) {
// Find URLs on their own line.
$content = preg_replace_callback( '|^(\s*)(https?://[^\s<>"]+)(\s*)$|im', array( $this, 'autoembed_callback' ), $content );
// Find URLs in their own paragraph.
$content = preg_replace_callback( '|(<p(?: [^>]*)?>\s*)(https?://[^\s<>"]+)(\s*<\/p>)|i', array( $this, 'autoembed_callback' ), $content );
}
// Put the line breaks back.
return str_replace( '<!-- wp-line-break -->', "\n", $content );
}
/**
* Callback function for WP_Embed::autoembed().
*
* @param array $match A regex match array.
* @return string The embed HTML on success, otherwise the original URL.
*/
public function autoembed_callback( $match ) {
$oldval = $this->linkifunknown;
$this->linkifunknown = false;
$return = $this->shortcode( array(), $match[2] );
$this->linkifunknown = $oldval;
return $match[1] . $return . $match[3];
}
/**
* Conditionally makes a hyperlink based on an internal class variable.
*
* @param string $url URL to potentially be linked.
* @return false|string Linked URL or the original URL. False if 'return_false_on_fail' is true.
*/
public function maybe_make_link( $url ) {
if ( $this->return_false_on_fail ) {
return false;
}
$output = ( $this->linkifunknown ) ? '<a href="' . esc_url( $url ) . '">' . esc_html( $url ) . '</a>' : $url;
/**
* Filters the returned, maybe-linked embed URL.
*
* @since 2.9.0
*
* @param string $output The linked or original URL.
* @param string $url The original URL.
*/
return apply_filters( 'embed_maybe_make_link', $output, $url );
}
/**
* Find the oEmbed cache post ID for a given cache key.
*
* @since 4.9.0
*
* @param string $cache_key oEmbed cache key.
* @return int|null Post ID on success, null on failure.
*/
public function find_oembed_post_id( $cache_key ) {
$cache_group = 'oembed_cache_post';
$oembed_post_id = wp_cache_get( $cache_key, $cache_group );
if ( $oembed_post_id && 'oembed_cache' === get_post_type( $oembed_post_id ) ) {
return $oembed_post_id;
}
$oembed_post_query = new WP_Query(
array(
'post_type' => 'oembed_cache',
'post_status' => 'publish',
'name' => $cache_key,
'posts_per_page' => 1,
'no_found_rows' => true,
'cache_results' => true,
'update_post_meta_cache' => false,
'update_post_term_cache' => false,
'lazy_load_term_meta' => false,
)
);
if ( ! empty( $oembed_post_query->posts ) ) {
// Note: 'fields'=>'ids' is not being used in order to cache the post object as it will be needed.
$oembed_post_id = $oembed_post_query->posts[0]->ID;
wp_cache_set( $cache_key, $oembed_post_id, $cache_group );
return $oembed_post_id;
}
return null;
}
}
<?php
/**
* Random_* Compatibility Library
* for using the new PHP 7 random_* API in PHP 5 projects
*
* The MIT License (MIT)
*
* Copyright (c) 2015 - 2017 Paragon Initiative Enterprises
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
if (!is_callable('random_bytes')) {
/**
* Windows with PHP < 5.3.0 will not have the function
* openssl_random_pseudo_bytes() available, so let's use
* CAPICOM to work around this deficiency.
*
* @param int $bytes
*
* @throws Exception
*
* @return string
*/
function random_bytes($bytes)
{
try {
$bytes = RandomCompat_intval($bytes);
} catch (TypeError $ex) {
throw new TypeError(
'random_bytes(): $bytes must be an integer'
);
}
if ($bytes < 1) {
throw new Error(
'Length must be greater than 0'
);
}
$buf = '';
if (!class_exists('COM')) {
throw new Error(
'COM does not exist'
);
}
$util = new COM('CAPICOM.Utilities.1');
$execCount = 0;
/**
* Let's not let it loop forever. If we run N times and fail to
* get N bytes of random data, then CAPICOM has failed us.
*/
do {
$buf .= base64_decode($util->GetRandom($bytes, 0));
if (RandomCompat_strlen($buf) >= $bytes) {
/**
* Return our random entropy buffer here:
*/
return RandomCompat_substr($buf, 0, $bytes);
}
++$execCount;
} while ($execCount < $bytes);
/**
* If we reach here, PHP has failed us.
*/
throw new Exception(
'Could not gather sufficient random data'
);
}
}<?php
/**
* Random_* Compatibility Library
* for using the new PHP 7 random_* API in PHP 5 projects
*
* The MIT License (MIT)
*
* Copyright (c) 2015 - 2017 Paragon Initiative Enterprises
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
if (!is_callable('RandomCompat_strlen')) {
if (
defined('MB_OVERLOAD_STRING') &&
ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING
) {
/**
* strlen() implementation that isn't brittle to mbstring.func_overload
*
* This version uses mb_strlen() in '8bit' mode to treat strings as raw
* binary rather than UTF-8, ISO-8859-1, etc
*
* @param string $binary_string
*
* @throws TypeError
*
* @return int
*/
function RandomCompat_strlen($binary_string)
{
if (!is_string($binary_string)) {
throw new TypeError(
'RandomCompat_strlen() expects a string'
);
}
return (int) mb_strlen($binary_string, '8bit');
}
} else {
/**
* strlen() implementation that isn't brittle to mbstring.func_overload
*
* This version just used the default strlen()
*
* @param string $binary_string
*
* @throws TypeError
*
* @return int
*/
function RandomCompat_strlen($binary_string)
{
if (!is_string($binary_string)) {
throw new TypeError(
'RandomCompat_strlen() expects a string'
);
}
return (int) strlen($binary_string);
}
}
}
if (!is_callable('RandomCompat_substr')) {
if (
defined('MB_OVERLOAD_STRING')
&&
ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING
) {
/**
* substr() implementation that isn't brittle to mbstring.func_overload
*
* This version uses mb_substr() in '8bit' mode to treat strings as raw
* binary rather than UTF-8, ISO-8859-1, etc
*
* @param string $binary_string
* @param int $start
* @param int $length (optional)
*
* @throws TypeError
*
* @return string
*/
function RandomCompat_substr($binary_string, $start, $length = null)
{
if (!is_string($binary_string)) {
throw new TypeError(
'RandomCompat_substr(): First argument should be a string'
);
}
if (!is_int($start)) {
throw new TypeError(
'RandomCompat_substr(): Second argument should be an integer'
);
}
if ($length === null) {
/**
* mb_substr($str, 0, NULL, '8bit') returns an empty string on
* PHP 5.3, so we have to find the length ourselves.
*/
$length = RandomCompat_strlen($binary_string) - $start;
} elseif (!is_int($length)) {
throw new TypeError(
'RandomCompat_substr(): Third argument should be an integer, or omitted'
);
}
// Consistency with PHP's behavior
if ($start === RandomCompat_strlen($binary_string) && $length === 0) {
return '';
}
if ($start > RandomCompat_strlen($binary_string)) {
return '';
}
return (string) mb_substr($binary_string, $start, $length, '8bit');
}
} else {
/**
* substr() implementation that isn't brittle to mbstring.func_overload
*
* This version just uses the default substr()
*
* @param string $binary_string
* @param int $start
* @param int $length (optional)
*
* @throws TypeError
*
* @return string
*/
function RandomCompat_substr($binary_string, $start, $length = null)
{
if (!is_string($binary_string)) {
throw new TypeError(
'RandomCompat_substr(): First argument should be a string'
);
}
if (!is_int($start)) {
throw new TypeError(
'RandomCompat_substr(): Second argument should be an integer'
);
}
if ($length !== null) {
if (!is_int($length)) {
throw new TypeError(
'RandomCompat_substr(): Third argument should be an integer, or omitted'
);
}
return (string) substr($binary_string, $start, $length);
}
return (string) substr($binary_string, $start);
}
}
}
<?php
/**
* Random_* Compatibility Library
* for using the new PHP 7 random_* API in PHP 5 projects
*
* The MIT License (MIT)
*
* Copyright (c) 2015 - 2017 Paragon Initiative Enterprises
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
if (!is_callable('RandomCompat_intval')) {
/**
* Cast to an integer if we can, safely.
*
* If you pass it a float in the range (~PHP_INT_MAX, PHP_INT_MAX)
* (non-inclusive), it will sanely cast it to an int. If you it's equal to
* ~PHP_INT_MAX or PHP_INT_MAX, we let it fail as not an integer. Floats
* lose precision, so the <= and => operators might accidentally let a float
* through.
*
* @param int|float $number The number we want to convert to an int
* @param bool $fail_open Set to true to not throw an exception
*
* @return float|int
* @psalm-suppress InvalidReturnType
*
* @throws TypeError
*/
function RandomCompat_intval($number, $fail_open = false)
{
if (is_int($number) || is_float($number)) {
$number += 0;
} elseif (is_numeric($number)) {
$number += 0;
}
if (
is_float($number)
&&
$number > ~PHP_INT_MAX
&&
$number < PHP_INT_MAX
) {
$number = (int) $number;
}
if (is_int($number)) {
return (int) $number;
} elseif (!$fail_open) {
throw new TypeError(
'Expected an integer.'
);
}
return $number;
}
}
<?php
/**
* Random_* Compatibility Library
* for using the new PHP 7 random_* API in PHP 5 projects
*
* @version 2.0.10
* @released 2017-03-13
*
* The MIT License (MIT)
*
* Copyright (c) 2015 - 2017 Paragon Initiative Enterprises
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
if (!defined('PHP_VERSION_ID')) {
// This constant was introduced in PHP 5.2.7
$RandomCompatversion = array_map('intval', explode('.', PHP_VERSION));
define(
'PHP_VERSION_ID',
$RandomCompatversion[0] * 10000
+ $RandomCompatversion[1] * 100
+ $RandomCompatversion[2]
);
$RandomCompatversion = null;
}
/**
* PHP 7.0.0 and newer have these functions natively.
*/
if (PHP_VERSION_ID >= 70000) {
return;
}
if (!defined('RANDOM_COMPAT_READ_BUFFER')) {
define('RANDOM_COMPAT_READ_BUFFER', 8);
}
$RandomCompatDIR = dirname(__FILE__);
require_once $RandomCompatDIR . '/byte_safe_strings.php';
require_once $RandomCompatDIR . '/cast_to_int.php';
require_once $RandomCompatDIR . '/error_polyfill.php';
if (!is_callable('random_bytes')) {
/**
* PHP 5.2.0 - 5.6.x way to implement random_bytes()
*
* We use conditional statements here to define the function in accordance
* to the operating environment. It's a micro-optimization.
*
* In order of preference:
* 1. Use libsodium if available.
* 2. fread() /dev/urandom if available (never on Windows)
* 3. mcrypt_create_iv($bytes, MCRYPT_DEV_URANDOM)
* 4. COM('CAPICOM.Utilities.1')->GetRandom()
*
* See RATIONALE.md for our reasoning behind this particular order
*/
if (extension_loaded('libsodium')) {
// See random_bytes_libsodium.php
if (PHP_VERSION_ID >= 50300 && is_callable('\\Sodium\\randombytes_buf')) {
require_once $RandomCompatDIR . '/random_bytes_libsodium.php';
} elseif (method_exists('Sodium', 'randombytes_buf')) {
require_once $RandomCompatDIR . '/random_bytes_libsodium_legacy.php';
}
}
/**
* Reading directly from /dev/urandom:
*/
if (DIRECTORY_SEPARATOR === '/') {
// DIRECTORY_SEPARATOR === '/' on Unix-like OSes -- this is a fast
// way to exclude Windows.
$RandomCompatUrandom = true;
$RandomCompat_basedir = ini_get('open_basedir');
if (!empty($RandomCompat_basedir)) {
$RandomCompat_open_basedir = explode(
PATH_SEPARATOR,
strtolower($RandomCompat_basedir)
);
$RandomCompatUrandom = (array() !== array_intersect(
array('/dev', '/dev/', '/dev/urandom'),
$RandomCompat_open_basedir
));
$RandomCompat_open_basedir = null;
}
if (
!is_callable('random_bytes')
&&
$RandomCompatUrandom
&&
@is_readable('/dev/urandom')
) {
// Error suppression on is_readable() in case of an open_basedir
// or safe_mode failure. All we care about is whether or not we
// can read it at this point. If the PHP environment is going to
// panic over trying to see if the file can be read in the first
// place, that is not helpful to us here.
// See random_bytes_dev_urandom.php
require_once $RandomCompatDIR . '/random_bytes_dev_urandom.php';
}
// Unset variables after use
$RandomCompat_basedir = null;
} else {
$RandomCompatUrandom = false;
}
/**
* mcrypt_create_iv()
*
* We only want to use mcypt_create_iv() if:
*
* - random_bytes() hasn't already been defined
* - the mcrypt extensions is loaded
* - One of these two conditions is true:
* - We're on Windows (DIRECTORY_SEPARATOR !== '/')
* - We're not on Windows and /dev/urandom is readabale
* (i.e. we're not in a chroot jail)
* - Special case:
* - If we're not on Windows, but the PHP version is between
* 5.6.10 and 5.6.12, we don't want to use mcrypt. It will
* hang indefinitely. This is bad.
* - If we're on Windows, we want to use PHP >= 5.3.7 or else
* we get insufficient entropy errors.
*/
if (
!is_callable('random_bytes')
&&
// Windows on PHP < 5.3.7 is broken, but non-Windows is not known to be.
(DIRECTORY_SEPARATOR === '/' || PHP_VERSION_ID >= 50307)
&&
// Prevent this code from hanging indefinitely on non-Windows;
// see https://bugs.php.net/bug.php?id=69833
(
DIRECTORY_SEPARATOR !== '/' ||
(PHP_VERSION_ID <= 50609 || PHP_VERSION_ID >= 50613)
)
&&
extension_loaded('mcrypt')
) {
// See random_bytes_mcrypt.php
require_once $RandomCompatDIR . '/random_bytes_mcrypt.php';
}
$RandomCompatUrandom = null;
/**
* This is a Windows-specific fallback, for when the mcrypt extension
* isn't loaded.
*/
if (
!is_callable('random_bytes')
&&
extension_loaded('com_dotnet')
&&
class_exists('COM')
) {
$RandomCompat_disabled_classes = preg_split(
'#\s*,\s*#',
strtolower(ini_get('disable_classes'))
);
if (!in_array('com', $RandomCompat_disabled_classes)) {
try {
$RandomCompatCOMtest = new COM('CAPICOM.Utilities.1');
if (method_exists($RandomCompatCOMtest, 'GetRandom')) {
// See random_bytes_com_dotnet.php
require_once $RandomCompatDIR . '/random_bytes_com_dotnet.php';
}
} catch (com_exception $e) {
// Don't try to use it.
}
}
$RandomCompat_disabled_classes = null;
$RandomCompatCOMtest = null;
}
/**
* throw new Exception
*/
if (!is_callable('random_bytes')) {
/**
* We don't have any more options, so let's throw an exception right now
* and hope the developer won't let it fail silently.
*
* @param mixed $length
* @return void
* @throws Exception
*/
function random_bytes($length)
{
unset($length); // Suppress "variable not used" warnings.
throw new Exception(
'There is no suitable CSPRNG installed on your system'
);
}
}
}
if (!is_callable('random_int')) {
require_once $RandomCompatDIR . '/random_int.php';
}
$RandomCompatDIR = null;
<?php
if (!is_callable('random_int')) {
/**
* Random_* Compatibility Library
* for using the new PHP 7 random_* API in PHP 5 projects
*
* The MIT License (MIT)
*
* Copyright (c) 2015 - 2017 Paragon Initiative Enterprises
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/**
* Fetch a random integer between $min and $max inclusive
*
* @param int $min
* @param int $max
*
* @throws Exception
*
* @return int
*/
function random_int($min, $max)
{
/**
* Type and input logic checks
*
* If you pass it a float in the range (~PHP_INT_MAX, PHP_INT_MAX)
* (non-inclusive), it will sanely cast it to an int. If you it's equal to
* ~PHP_INT_MAX or PHP_INT_MAX, we let it fail as not an integer. Floats
* lose precision, so the <= and => operators might accidentally let a float
* through.
*/
try {
$min = RandomCompat_intval($min);
} catch (TypeError $ex) {
throw new TypeError(
'random_int(): $min must be an integer'
);
}
try {
$max = RandomCompat_intval($max);
} catch (TypeError $ex) {
throw new TypeError(
'random_int(): $max must be an integer'
);
}
/**
* Now that we've verified our weak typing system has given us an integer,
* let's validate the logic then we can move forward with generating random
* integers along a given range.
*/
if ($min > $max) {
throw new Error(
'Minimum value must be less than or equal to the maximum value'
);
}
if ($max === $min) {
return (int) $min;
}
/**
* Initialize variables to 0
*
* We want to store:
* $bytes => the number of random bytes we need
* $mask => an integer bitmask (for use with the &) operator
* so we can minimize the number of discards
*/
$attempts = $bits = $bytes = $mask = $valueShift = 0;
/**
* At this point, $range is a positive number greater than 0. It might
* overflow, however, if $max - $min > PHP_INT_MAX. PHP will cast it to
* a float and we will lose some precision.
*/
$range = $max - $min;
/**
* Test for integer overflow:
*/
if (!is_int($range)) {
/**
* Still safely calculate wider ranges.
* Provided by @CodesInChaos, @oittaa
*
* @ref https://gist.github.com/CodesInChaos/03f9ea0b58e8b2b8d435
*
* We use ~0 as a mask in this case because it generates all 1s
*
* @ref https://eval.in/400356 (32-bit)
* @ref http://3v4l.org/XX9r5 (64-bit)
*/
$bytes = PHP_INT_SIZE;
$mask = ~0;
} else {
/**
* $bits is effectively ceil(log($range, 2)) without dealing with
* type juggling
*/
while ($range > 0) {
if ($bits % 8 === 0) {
++$bytes;
}
++$bits;
$range >>= 1;
$mask = $mask << 1 | 1;
}
$valueShift = $min;
}
$val = 0;
/**
* Now that we have our parameters set up, let's begin generating
* random integers until one falls between $min and $max
*/
do {
/**
* The rejection probability is at most 0.5, so this corresponds
* to a failure probability of 2^-128 for a working RNG
*/
if ($attempts > 128) {
throw new Exception(
'random_int: RNG is broken - too many rejections'
);
}
/**
* Let's grab the necessary number of random bytes
*/
$randomByteString = random_bytes($bytes);
/**
* Let's turn $randomByteString into an integer
*
* This uses bitwise operators (<< and |) to build an integer
* out of the values extracted from ord()
*
* Example: [9F] | [6D] | [32] | [0C] =>
* 159 + 27904 + 3276800 + 201326592 =>
* 204631455
*/
$val &= 0;
for ($i = 0; $i < $bytes; ++$i) {
$val |= ord($randomByteString[$i]) << ($i * 8);
}
/**
* Apply mask
*/
$val &= $mask;
$val += $valueShift;
++$attempts;
/**
* If $val overflows to a floating point number,
* ... or is larger than $max,
* ... or smaller than $min,
* then try again.
*/
} while (!is_int($val) || $val > $max || $val < $min);
return (int) $val;
}
}
<?php
/**
* Random_* Compatibility Library
* for using the new PHP 7 random_* API in PHP 5 projects
*
* The MIT License (MIT)
*
* Copyright (c) 2015 - 2017 Paragon Initiative Enterprises
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
if (!defined('RANDOM_COMPAT_READ_BUFFER')) {
define('RANDOM_COMPAT_READ_BUFFER', 8);
}
if (!is_callable('random_bytes')) {
/**
* Unless open_basedir is enabled, use /dev/urandom for
* random numbers in accordance with best practices
*
* Why we use /dev/urandom and not /dev/random
* @ref http://sockpuppet.org/blog/2014/02/25/safely-generate-random-numbers
*
* @param int $bytes
*
* @throws Exception
*
* @return string
*/
function random_bytes($bytes)
{
static $fp = null;
/**
* This block should only be run once
*/
if (empty($fp)) {
/**
* We use /dev/urandom if it is a char device.
* We never fall back to /dev/random
*/
$fp = fopen('/dev/urandom', 'rb');
if (!empty($fp)) {
$st = fstat($fp);
if (($st['mode'] & 0170000) !== 020000) {
fclose($fp);
$fp = false;
}
}
if (!empty($fp)) {
/**
* stream_set_read_buffer() does not exist in HHVM
*
* If we don't set the stream's read buffer to 0, PHP will
* internally buffer 8192 bytes, which can waste entropy
*
* stream_set_read_buffer returns 0 on success
*/
if (is_callable('stream_set_read_buffer')) {
stream_set_read_buffer($fp, RANDOM_COMPAT_READ_BUFFER);
}
if (is_callable('stream_set_chunk_size')) {
stream_set_chunk_size($fp, RANDOM_COMPAT_READ_BUFFER);
}
}
}
try {
$bytes = RandomCompat_intval($bytes);
} catch (TypeError $ex) {
throw new TypeError(
'random_bytes(): $bytes must be an integer'
);
}
if ($bytes < 1) {
throw new Error(
'Length must be greater than 0'
);
}
/**
* This if() block only runs if we managed to open a file handle
*
* It does not belong in an else {} block, because the above
* if (empty($fp)) line is logic that should only be run once per
* page load.
*/
if (!empty($fp)) {
/**
* @var int
*/
$remaining = $bytes;
/**
* @var string|bool
*/
$buf = '';
/**
* We use fread() in a loop to protect against partial reads
*/
do {
/**
* @var string|bool
*/
$read = fread($fp, $remaining);
if (!is_string($read)) {
if ($read === false) {
/**
* We cannot safely read from the file. Exit the
* do-while loop and trigger the exception condition
*
* @var string|bool
*/
$buf = false;
break;
}
}
/**
* Decrease the number of bytes returned from remaining
*/
$remaining -= RandomCompat_strlen($read);
/**
* @var string|bool
*/
$buf = $buf . $read;
} while ($remaining > 0);
/**
* Is our result valid?
*/
if (is_string($buf)) {
if (RandomCompat_strlen($buf) === $bytes) {
/**
* Return our random entropy buffer here:
*/
return $buf;
}
}
}
/**
* If we reach here, PHP has failed us.
*/
throw new Exception(
'Error reading from source device'
);
}
}
<?php
/**
* Random_* Compatibility Library
* for using the new PHP 7 random_* API in PHP 5 projects
*
* The MIT License (MIT)
*
* Copyright (c) 2015 - 2017 Paragon Initiative Enterprises
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
if (!is_callable('random_bytes')) {
/**
* If the libsodium PHP extension is loaded, we'll use it above any other
* solution.
*
* libsodium-php project:
* @ref https://github.com/jedisct1/libsodium-php
*
* @param int $bytes
*
* @throws Exception
*
* @return string
*/
function random_bytes($bytes)
{
try {
$bytes = RandomCompat_intval($bytes);
} catch (TypeError $ex) {
throw new TypeError(
'random_bytes(): $bytes must be an integer'
);
}
if ($bytes < 1) {
throw new Error(
'Length must be greater than 0'
);
}
/**
* @var string
*/
$buf = '';
/**
* \Sodium\randombytes_buf() doesn't allow more than 2147483647 bytes to be
* generated in one invocation.
*/
if ($bytes > 2147483647) {
for ($i = 0; $i < $bytes; $i += 1073741824) {
$n = ($bytes - $i) > 1073741824
? 1073741824
: $bytes - $i;
$buf .= Sodium::randombytes_buf((int) $n);
}
} else {
$buf .= Sodium::randombytes_buf((int) $bytes);
}
if (is_string($buf)) {
if (RandomCompat_strlen($buf) === $bytes) {
return $buf;
}
}
/**
* If we reach here, PHP has failed us.
*/
throw new Exception(
'Could not gather sufficient random data'
);
}
}
<?php
/**
* Random_* Compatibility Library
* for using the new PHP 7 random_* API in PHP 5 projects
*
* The MIT License (MIT)
*
* Copyright (c) 2015 - 2017 Paragon Initiative Enterprises
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
if (!class_exists('Error', false)) {
// We can't really avoid making this extend Exception in PHP 5.
class Error extends Exception
{
}
}
if (!class_exists('TypeError', false)) {
if (is_subclass_of('Error', 'Exception')) {
class TypeError extends Error
{
}
} else {
class TypeError extends Exception
{
}
}
}
<?php
/**
* Random_* Compatibility Library
* for using the new PHP 7 random_* API in PHP 5 projects
*
* The MIT License (MIT)
*
* Copyright (c) 2015 - 2017 Paragon Initiative Enterprises
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
if (!is_callable('random_bytes')) {
/**
* Powered by ext/mcrypt (and thankfully NOT libmcrypt)
*
* @ref https://bugs.php.net/bug.php?id=55169
* @ref https://github.com/php/php-src/blob/c568ffe5171d942161fc8dda066bce844bdef676/ext/mcrypt/mcrypt.c#L1321-L1386
*
* @param int $bytes
*
* @throws Exception
*
* @return string
*/
function random_bytes($bytes)
{
try {
$bytes = RandomCompat_intval($bytes);
} catch (TypeError $ex) {
throw new TypeError(
'random_bytes(): $bytes must be an integer'
);
}
if ($bytes < 1) {
throw new Error(
'Length must be greater than 0'
);
}
$buf = @mcrypt_create_iv($bytes, MCRYPT_DEV_URANDOM);
if (
$buf !== false
&&
RandomCompat_strlen($buf) === $bytes
) {
/**
* Return our random entropy buffer here:
*/
return $buf;
}
/**
* If we reach here, PHP has failed us.
*/
throw new Exception(
'Could not gather sufficient random data'
);
}
}
<?php
/**
* Random_* Compatibility Library
* for using the new PHP 7 random_* API in PHP 5 projects
*
* The MIT License (MIT)
*
* Copyright (c) 2015 - 2017 Paragon Initiative Enterprises
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
if (!is_callable('random_bytes')) {
/**
* If the libsodium PHP extension is loaded, we'll use it above any other
* solution.
*
* libsodium-php project:
* @ref https://github.com/jedisct1/libsodium-php
*
* @param int $bytes
*
* @throws Exception
*
* @return string
*/
function random_bytes($bytes)
{
try {
$bytes = RandomCompat_intval($bytes);
} catch (TypeError $ex) {
throw new TypeError(
'random_bytes(): $bytes must be an integer'
);
}
if ($bytes < 1) {
throw new Error(
'Length must be greater than 0'
);
}
/**
* \Sodium\randombytes_buf() doesn't allow more than 2147483647 bytes to be
* generated in one invocation.
*/
if ($bytes > 2147483647) {
$buf = '';
for ($i = 0; $i < $bytes; $i += 1073741824) {
$n = ($bytes - $i) > 1073741824
? 1073741824
: $bytes - $i;
$buf .= \Sodium\randombytes_buf($n);
}
} else {
$buf = \Sodium\randombytes_buf($bytes);
}
if ($buf !== false) {
if (RandomCompat_strlen($buf) === $bytes) {
return $buf;
}
}
/**
* If we reach here, PHP has failed us.
*/
throw new Exception(
'Could not gather sufficient random data'
);
}
}
<?php
/**
* Object Cache API
*
* @link https://sitepad.com/docs/Class_Reference/WP_Object_Cache
*
* @package WordPress
* @subpackage Cache
*/
/**
* Adds data to the cache, if the cache key doesn't already exist.
*
* @since 2.0.0
*
* @see WP_Object_Cache::add()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @param int|string $key The cache key to use for retrieval later.
* @param mixed $data The data to add to the cache.
* @param string $group Optional. The group to add the cache to. Enables the same key
* to be used across groups. Default empty.
* @param int $expire Optional. When the cache data should expire, in seconds.
* Default 0 (no expiration).
* @return bool False if cache key and group already exist, true on success.
*/
function wp_cache_add( $key, $data, $group = '', $expire = 0 ) {
global $wp_object_cache;
return $wp_object_cache->add( $key, $data, $group, (int) $expire );
}
/**
* Closes the cache.
*
* This function has ceased to do anything since WordPress 2.5. The
* functionality was removed along with the rest of the persistent cache.
*
* This does not mean that plugins can't implement this function when they need
* to make sure that the cache is cleaned up after WordPress no longer needs it.
*
* @since 2.0.0
*
* @return true Always returns true.
*/
function wp_cache_close() {
return true;
}
/**
* Decrements numeric cache item's value.
*
* @since 3.3.0
*
* @see WP_Object_Cache::decr()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @param int|string $key The cache key to decrement.
* @param int $offset Optional. The amount by which to decrement the item's value. Default 1.
* @param string $group Optional. The group the key is in. Default empty.
* @return false|int False on failure, the item's new value on success.
*/
function wp_cache_decr( $key, $offset = 1, $group = '' ) {
global $wp_object_cache;
return $wp_object_cache->decr( $key, $offset, $group );
}
/**
* Removes the cache contents matching key and group.
*
* @since 2.0.0
*
* @see WP_Object_Cache::delete()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @param int|string $key What the contents in the cache are called.
* @param string $group Optional. Where the cache contents are grouped. Default empty.
* @return bool True on successful removal, false on failure.
*/
function wp_cache_delete( $key, $group = '' ) {
global $wp_object_cache;
return $wp_object_cache->delete( $key, $group );
}
/**
* Removes all cache items.
*
* @since 2.0.0
*
* @see WP_Object_Cache::flush()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @return bool False on failure, true on success
*/
function wp_cache_flush() {
global $wp_object_cache;
return $wp_object_cache->flush();
}
/**
* Retrieves the cache contents from the cache by key and group.
*
* @since 2.0.0
*
* @see WP_Object_Cache::get()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @param int|string $key The key under which the cache contents are stored.
* @param string $group Optional. Where the cache contents are grouped. Default empty.
* @param bool $force Optional. Whether to force an update of the local cache from the persistent
* cache. Default false.
* @param bool $found Optional. Whether the key was found in the cache (passed by reference).
* Disambiguates a return of false, a storable value. Default null.
* @return bool|mixed False on failure to retrieve contents or the cache
* contents on success
*/
function wp_cache_get( $key, $group = '', $force = false, &$found = null ) {
global $wp_object_cache;
return $wp_object_cache->get( $key, $group, $force, $found );
}
/**
* Increment numeric cache item's value
*
* @since 3.3.0
*
* @see WP_Object_Cache::incr()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @param int|string $key The key for the cache contents that should be incremented.
* @param int $offset Optional. The amount by which to increment the item's value. Default 1.
* @param string $group Optional. The group the key is in. Default empty.
* @return false|int False on failure, the item's new value on success.
*/
function wp_cache_incr( $key, $offset = 1, $group = '' ) {
global $wp_object_cache;
return $wp_object_cache->incr( $key, $offset, $group );
}
/**
* Sets up Object Cache Global and assigns it.
*
* @since 2.0.0
*
* @global WP_Object_Cache $wp_object_cache
*/
function wp_cache_init() {
$GLOBALS['wp_object_cache'] = new WP_Object_Cache();
}
/**
* Replaces the contents of the cache with new data.
*
* @since 2.0.0
*
* @see WP_Object_Cache::replace()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @param int|string $key The key for the cache data that should be replaced.
* @param mixed $data The new data to store in the cache.
* @param string $group Optional. The group for the cache data that should be replaced.
* Default empty.
* @param int $expire Optional. When to expire the cache contents, in seconds.
* Default 0 (no expiration).
* @return bool False if original value does not exist, true if contents were replaced
*/
function wp_cache_replace( $key, $data, $group = '', $expire = 0 ) {
global $wp_object_cache;
return $wp_object_cache->replace( $key, $data, $group, (int) $expire );
}
/**
* Saves the data to the cache.
*
* Differs from wp_cache_add() and wp_cache_replace() in that it will always write data.
*
* @since 2.0.0
*
* @see WP_Object_Cache::set()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @param int|string $key The cache key to use for retrieval later.
* @param mixed $data The contents to store in the cache.
* @param string $group Optional. Where to group the cache contents. Enables the same key
* to be used across groups. Default empty.
* @param int $expire Optional. When to expire the cache contents, in seconds.
* Default 0 (no expiration).
* @return bool False on failure, true on success
*/
function wp_cache_set( $key, $data, $group = '', $expire = 0 ) {
global $wp_object_cache;
return $wp_object_cache->set( $key, $data, $group, (int) $expire );
}
/**
* Switches the internal blog ID.
*
* This changes the blog id used to create keys in blog specific groups.
*
* @since 3.5.0
*
* @see WP_Object_Cache::switch_to_blog()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @param int $blog_id Site ID.
*/
function wp_cache_switch_to_blog( $blog_id ) {
global $wp_object_cache;
$wp_object_cache->switch_to_blog( $blog_id );
}
/**
* Adds a group or set of groups to the list of global groups.
*
* @since 2.6.0
*
* @see WP_Object_Cache::add_global_groups()
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*
* @param string|array $groups A group or an array of groups to add.
*/
function wp_cache_add_global_groups( $groups ) {
global $wp_object_cache;
$wp_object_cache->add_global_groups( $groups );
}
/**
* Adds a group or set of groups to the list of non-persistent groups.
*
* @since 2.6.0
*
* @param string|array $groups A group or an array of groups to add.
*/
function wp_cache_add_non_persistent_groups( $groups ) {
// Default cache doesn't persist so nothing to do here.
}
/**
* Reset internal cache keys and structures.
*
* If the cache back end uses global blog or site IDs as part of its cache keys,
* this function instructs the back end to reset those keys and perform any cleanup
* since blog or site IDs have changed since cache init.
*
* This function is deprecated. Use wp_cache_switch_to_blog() instead of this
* function when preparing the cache for a blog switch. For clearing the cache
* during unit tests, consider using wp_cache_init(). wp_cache_init() is not
* recommended outside of unit tests as the performance penalty for using it is
* high.
*
* @since 2.6.0
* @deprecated 3.5.0 WP_Object_Cache::reset()
* @see WP_Object_Cache::reset()
*
* @global WP_Object_Cache $wp_object_cache Object cache global instance.
*/
function wp_cache_reset() {
_deprecated_function( __FUNCTION__, '3.5.0', 'WP_Object_Cache::reset()' );
global $wp_object_cache;
$wp_object_cache->reset();
}
/**
* Core class that implements an object cache.
*
* The WordPress Object Cache is used to save on trips to the database. The
* Object Cache stores all of the cache data to memory and makes the cache
* contents available by using a key, which is used to name and later retrieve
* the cache contents.
*
* The Object Cache can be replaced by other caching mechanisms by placing files
* in the wp-content folder which is looked at in wp-settings. If that file
* exists, then this file will not be included.
*
* @since 2.0.0
*/
class WP_Object_Cache {
/**
* Holds the cached objects.
*
* @since 2.0.0
* @var array
*/
private $cache = array();
/**
* The amount of times the cache data was already stored in the cache.
*
* @since 2.5.0
* @var int
*/
public $cache_hits = 0;
/**
* Amount of times the cache did not have the request in cache.
*
* @since 2.0.0
* @var int
*/
public $cache_misses = 0;
/**
* List of global cache groups.
*
* @since 3.0.0
* @var array
*/
protected $global_groups = array();
/**
* The blog prefix to prepend to keys in non-global groups.
*
* @since 3.5.0
* @var int
*/
private $blog_prefix;
/**
* Holds the value of is_multisite().
*
* @since 3.5.0
* @var bool
*/
private $multisite;
/**
* Makes private properties readable for backward compatibility.
*
* @since 4.0.0
*
* @param string $name Property to get.
* @return mixed Property.
*/
public function __get( $name ) {
return $this->$name;
}
/**
* Makes private properties settable for backward compatibility.
*
* @since 4.0.0
*
* @param string $name Property to set.
* @param mixed $value Property value.
* @return mixed Newly-set property.
*/
public function __set( $name, $value ) {
return $this->$name = $value;
}
/**
* Makes private properties checkable for backward compatibility.
*
* @since 4.0.0
*
* @param string $name Property to check if set.
* @return bool Whether the property is set.
*/
public function __isset( $name ) {
return isset( $this->$name );
}
/**
* Makes private properties un-settable for backward compatibility.
*
* @since 4.0.0
*
* @param string $name Property to unset.
*/
public function __unset( $name ) {
unset( $this->$name );
}
/**
* Adds data to the cache if it doesn't already exist.
*
* @since 2.0.0
*
* @uses WP_Object_Cache::_exists() Checks to see if the cache already has data.
* @uses WP_Object_Cache::set() Sets the data after the checking the cache
* contents existence.
*
* @param int|string $key What to call the contents in the cache.
* @param mixed $data The contents to store in the cache.
* @param string $group Optional. Where to group the cache contents. Default 'default'.
* @param int $expire Optional. When to expire the cache contents. Default 0 (no expiration).
* @return bool False if cache key and group already exist, true on success
*/
public function add( $key, $data, $group = 'default', $expire = 0 ) {
if ( wp_suspend_cache_addition() ) {
return false;
}
if ( empty( $group ) ) {
$group = 'default';
}
$id = $key;
if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) {
$id = $this->blog_prefix . $key;
}
if ( $this->_exists( $id, $group ) ) {
return false;
}
return $this->set( $key, $data, $group, (int) $expire );
}
/**
* Sets the list of global cache groups.
*
* @since 3.0.0
*
* @param array $groups List of groups that are global.
*/
public function add_global_groups( $groups ) {
$groups = (array) $groups;
$groups = array_fill_keys( $groups, true );
$this->global_groups = array_merge( $this->global_groups, $groups );
}
/**
* Decrements numeric cache item's value.
*
* @since 3.3.0
*
* @param int|string $key The cache key to decrement.
* @param int $offset Optional. The amount by which to decrement the item's value. Default 1.
* @param string $group Optional. The group the key is in. Default 'default'.
* @return false|int False on failure, the item's new value on success.
*/
public function decr( $key, $offset = 1, $group = 'default' ) {
if ( empty( $group ) ) {
$group = 'default';
}
if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) {
$key = $this->blog_prefix . $key;
}
if ( ! $this->_exists( $key, $group ) ) {
return false;
}
if ( ! is_numeric( $this->cache[ $group ][ $key ] ) ) {
$this->cache[ $group ][ $key ] = 0;
}
$offset = (int) $offset;
$this->cache[ $group ][ $key ] -= $offset;
if ( $this->cache[ $group ][ $key ] < 0 ) {
$this->cache[ $group ][ $key ] = 0;
}
return $this->cache[ $group ][ $key ];
}
/**
* Removes the contents of the cache key in the group.
*
* If the cache key does not exist in the group, then nothing will happen.
*
* @since 2.0.0
*
* @param int|string $key What the contents in the cache are called.
* @param string $group Optional. Where the cache contents are grouped. Default 'default'.
* @param bool $deprecated Optional. Unused. Default false.
* @return bool False if the contents weren't deleted and true on success.
*/
public function delete( $key, $group = 'default', $deprecated = false ) {
if ( empty( $group ) ) {
$group = 'default';
}
if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) {
$key = $this->blog_prefix . $key;
}
if ( ! $this->_exists( $key, $group ) ) {
return false;
}
unset( $this->cache[ $group ][ $key ] );
return true;
}
/**
* Clears the object cache of all data.
*
* @since 2.0.0
*
* @return true Always returns true.
*/
public function flush() {
$this->cache = array();
return true;
}
/**
* Retrieves the cache contents, if it exists.
*
* The contents will be first attempted to be retrieved by searching by the
* key in the cache group. If the cache is hit (success) then the contents
* are returned.
*
* On failure, the number of cache misses will be incremented.
*
* @since 2.0.0
*
* @param int|string $key What the contents in the cache are called.
* @param string $group Optional. Where the cache contents are grouped. Default 'default'.
* @param bool $force Optional. Unused. Whether to force a refetch rather than relying on the local
* cache. Default false.
* @param bool $found Optional. Whether the key was found in the cache (passed by reference).
* Disambiguates a return of false, a storable value. Default null.
* @return false|mixed False on failure to retrieve contents or the cache contents on success.
*/
public function get( $key, $group = 'default', $force = false, &$found = null ) {
if ( empty( $group ) ) {
$group = 'default';
}
if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) {
$key = $this->blog_prefix . $key;
}
if ( $this->_exists( $key, $group ) ) {
$found = true;
$this->cache_hits += 1;
if ( is_object( $this->cache[ $group ][ $key ] ) ) {
return clone $this->cache[ $group ][ $key ];
} else {
return $this->cache[ $group ][ $key ];
}
}
$found = false;
$this->cache_misses += 1;
return false;
}
/**
* Increments numeric cache item's value.
*
* @since 3.3.0
*
* @param int|string $key The cache key to increment
* @param int $offset Optional. The amount by which to increment the item's value. Default 1.
* @param string $group Optional. The group the key is in. Default 'default'.
* @return false|int False on failure, the item's new value on success.
*/
public function incr( $key, $offset = 1, $group = 'default' ) {
if ( empty( $group ) ) {
$group = 'default';
}
if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) {
$key = $this->blog_prefix . $key;
}
if ( ! $this->_exists( $key, $group ) ) {
return false;
}
if ( ! is_numeric( $this->cache[ $group ][ $key ] ) ) {
$this->cache[ $group ][ $key ] = 0;
}
$offset = (int) $offset;
$this->cache[ $group ][ $key ] += $offset;
if ( $this->cache[ $group ][ $key ] < 0 ) {
$this->cache[ $group ][ $key ] = 0;
}
return $this->cache[ $group ][ $key ];
}
/**
* Replaces the contents in the cache, if contents already exist.
*
* @since 2.0.0
*
* @see WP_Object_Cache::set()
*
* @param int|string $key What to call the contents in the cache.
* @param mixed $data The contents to store in the cache.
* @param string $group Optional. Where to group the cache contents. Default 'default'.
* @param int $expire Optional. When to expire the cache contents. Default 0 (no expiration).
* @return bool False if not exists, true if contents were replaced.
*/
public function replace( $key, $data, $group = 'default', $expire = 0 ) {
if ( empty( $group ) ) {
$group = 'default';
}
$id = $key;
if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) {
$id = $this->blog_prefix . $key;
}
if ( ! $this->_exists( $id, $group ) ) {
return false;
}
return $this->set( $key, $data, $group, (int) $expire );
}
/**
* Resets cache keys.
*
* @since 3.0.0
*
* @deprecated 3.5.0 Use switch_to_blog()
* @see switch_to_blog()
*/
public function reset() {
_deprecated_function( __FUNCTION__, '3.5.0', 'switch_to_blog()' );
// Clear out non-global caches since the blog ID has changed.
foreach ( array_keys( $this->cache ) as $group ) {
if ( ! isset( $this->global_groups[ $group ] ) ) {
unset( $this->cache[ $group ] );
}
}
}
/**
* Sets the data contents into the cache.
*
* The cache contents is grouped by the $group parameter followed by the
* $key. This allows for duplicate ids in unique groups. Therefore, naming of
* the group should be used with care and should follow normal function
* naming guidelines outside of core WordPress usage.
*
* The $expire parameter is not used, because the cache will automatically
* expire for each time a page is accessed and PHP finishes. The method is
* more for cache plugins which use files.
*
* @since 2.0.0
*
* @param int|string $key What to call the contents in the cache.
* @param mixed $data The contents to store in the cache.
* @param string $group Optional. Where to group the cache contents. Default 'default'.
* @param int $expire Not Used.
* @return true Always returns true.
*/
public function set( $key, $data, $group = 'default', $expire = 0 ) {
if ( empty( $group ) ) {
$group = 'default';
}
if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) {
$key = $this->blog_prefix . $key;
}
if ( is_object( $data ) ) {
$data = clone $data;
}
$this->cache[ $group ][ $key ] = $data;
return true;
}
/**
* Echoes the stats of the caching.
*
* Gives the cache hits, and cache misses. Also prints every cached group,
* key and the data.
*
* @since 2.0.0
*/
public function stats() {
echo '<p>';
echo "<strong>Cache Hits:</strong> {$this->cache_hits}<br />";
echo "<strong>Cache Misses:</strong> {$this->cache_misses}<br />";
echo '</p>';
echo '<ul>';
foreach ( $this->cache as $group => $cache ) {
echo '<li><strong>Group:</strong> ' . esc_html( $group ) . ' - ( ' . number_format( strlen( serialize( $cache ) ) / KB_IN_BYTES, 2 ) . 'k )</li>';
}
echo '</ul>';
}
/**
* Switches the internal blog ID.
*
* This changes the blog ID used to create keys in blog specific groups.
*
* @since 3.5.0
*
* @param int $blog_id Blog ID.
*/
public function switch_to_blog( $blog_id ) {
$blog_id = (int) $blog_id;
$this->blog_prefix = $this->multisite ? $blog_id . ':' : '';
}
/**
* Serves as a utility function to determine whether a key exists in the cache.
*
* @since 3.4.0
*
* @param int|string $key Cache key to check for existence.
* @param string $group Cache group for the key existence check.
* @return bool Whether the key exists in the cache for the given group.
*/
protected function _exists( $key, $group ) {
return isset( $this->cache[ $group ] ) && ( isset( $this->cache[ $group ][ $key ] ) || array_key_exists( $key, $this->cache[ $group ] ) );
}
/**
* Sets up object properties; PHP 5 style constructor.
*
* @since 2.0.8
*/
public function __construct() {
$this->multisite = is_multisite();
$this->blog_prefix = $this->multisite ? get_current_blog_id() . ':' : '';
/**
* @todo This should be moved to the PHP4 style constructor, PHP5
* already calls __destruct()
*/
register_shutdown_function( array( $this, '__destruct' ) );
}
/**
* Saves the object cache before object is completely destroyed.
*
* Called upon object destruction, which should be when PHP ends.
*
* @since 2.0.8
*
* @return true Always returns true.
*/
public function __destruct() {
return true;
}
}
<?php
/**
* The plugin API is located in this file, which allows for creating actions
* and filters and hooking functions, and methods. The functions or methods will
* then be run when the action or filter is called.
*
* The API callback examples reference functions, but can be methods of classes.
* To hook methods, you'll need to pass an array one of two ways.
*
* Any of the syntaxes explained in the PHP documentation for the
* {@link https://secure.php.net/manual/en/language.pseudo-types.php#language.types.callback 'callback'}
* type are valid.
*
* Also see the {@link https://sitepad.com/docs/Plugin_API Plugin API} for
* more information and examples on how to use a lot of these functions.
*
* This file should have no external dependencies.
*
* @package WordPress
* @subpackage Plugin
* @since 1.5.0
*/
// Initialize the filter globals.
require( dirname( __FILE__ ) . '/class-wp-hook.php' );
/** @var WP_Hook[] $wp_filter */
global $wp_filter, $wp_actions, $wp_current_filter;
if ( $wp_filter ) {
$wp_filter = WP_Hook::build_preinitialized_hooks( $wp_filter );
} else {
$wp_filter = array();
}
if ( ! isset( $wp_actions ) ) {
$wp_actions = array();
}
if ( ! isset( $wp_current_filter ) ) {
$wp_current_filter = array();
}
/**
* Hook a function or method to a specific filter action.
*
* WordPress offers filter hooks to allow plugins to modify
* various types of internal data at runtime.
*
* A plugin can modify data by binding a callback to a filter hook. When the filter
* is later applied, each bound callback is run in order of priority, and given
* the opportunity to modify a value by returning a new value.
*
* The following example shows how a callback function is bound to a filter hook.
*
* Note that `$example` is passed to the callback, (maybe) modified, then returned:
*
* function example_callback( $example ) {
* // Maybe modify $example in some way.
* return $example;
* }
* add_filter( 'example_filter', 'example_callback' );
*
* Bound callbacks can accept from none to the total number of arguments passed as parameters
* in the corresponding apply_filters() call.
*
* In other words, if an apply_filters() call passes four total arguments, callbacks bound to
* it can accept none (the same as 1) of the arguments or up to four. The important part is that
* the `$accepted_args` value must reflect the number of arguments the bound callback *actually*
* opted to accept. If no arguments were accepted by the callback that is considered to be the
* same as accepting 1 argument. For example:
*
* // Filter call.
* $value = apply_filters( 'hook', $value, $arg2, $arg3 );
*
* // Accepting zero/one arguments.
* function example_callback() {
* ...
* return 'some value';
* }
* add_filter( 'hook', 'example_callback' ); // Where $priority is default 10, $accepted_args is default 1.
*
* // Accepting two arguments (three possible).
* function example_callback( $value, $arg2 ) {
* ...
* return $maybe_modified_value;
* }
* add_filter( 'hook', 'example_callback', 10, 2 ); // Where $priority is 10, $accepted_args is 2.
*
* *Note:* The function will return true whether or not the callback is valid.
* It is up to you to take care. This is done for optimization purposes, so
* everything is as quick as possible.
*
* @since 0.71
*
* @global array $wp_filter A multidimensional array of all hooks and the callbacks hooked to them.
*
* @param string $tag The name of the filter to hook the $function_to_add callback to.
* @param callable $function_to_add The callback to be run when the filter is applied.
* @param int $priority Optional. Used to specify the order in which the functions
* associated with a particular action are executed. Default 10.
* Lower numbers correspond with earlier execution,
* and functions with the same priority are executed
* in the order in which they were added to the action.
* @param int $accepted_args Optional. The number of arguments the function accepts. Default 1.
* @return true
*/
function add_filter( $tag, $function_to_add, $priority = 10, $accepted_args = 1 ) {
global $wp_filter;
if ( ! isset( $wp_filter[ $tag ] ) ) {
$wp_filter[ $tag ] = new WP_Hook();
}
$wp_filter[ $tag ]->add_filter( $tag, $function_to_add, $priority, $accepted_args );
return true;
}
/**
* Check if any filter has been registered for a hook.
*
* @since 2.5.0
*
* @global array $wp_filter Stores all of the filters.
*
* @param string $tag The name of the filter hook.
* @param callable|bool $function_to_check Optional. The callback to check for. Default false.
* @return false|int If $function_to_check is omitted, returns boolean for whether the hook has
* anything registered. When checking a specific function, the priority of that
* hook is returned, or false if the function is not attached. When using the
* $function_to_check argument, this function may return a non-boolean value
* that evaluates to false (e.g.) 0, so use the === operator for testing the
* return value.
*/
function has_filter( $tag, $function_to_check = false ) {
global $wp_filter;
if ( ! isset( $wp_filter[ $tag ] ) ) {
return false;
}
return $wp_filter[ $tag ]->has_filter( $tag, $function_to_check );
}
/**
* Call the functions added to a filter hook.
*
* The callback functions attached to filter hook $tag are invoked by calling
* this function. This function can be used to create a new filter hook by
* simply calling this function with the name of the new hook specified using
* the $tag parameter.
*
* The function allows for additional arguments to be added and passed to hooks.
*
* // Our filter callback function
* function example_callback( $string, $arg1, $arg2 ) {
* // (maybe) modify $string
* return $string;
* }
* add_filter( 'example_filter', 'example_callback', 10, 3 );
*
* /*
* * Apply the filters by calling the 'example_callback' function we
* * "hooked" to 'example_filter' using the add_filter() function above.
* * - 'example_filter' is the filter hook $tag
* * - 'filter me' is the value being filtered
* * - $arg1 and $arg2 are the additional arguments passed to the callback.
* $value = apply_filters( 'example_filter', 'filter me', $arg1, $arg2 );
*
* @since 0.71
*
* @global array $wp_filter Stores all of the filters.
* @global array $wp_current_filter Stores the list of current filters with the current one last.
*
* @param string $tag The name of the filter hook.
* @param mixed $value The value on which the filters hooked to `$tag` are applied on.
* @param mixed $var,... Additional variables passed to the functions hooked to `$tag`.
* @return mixed The filtered value after all hooked functions are applied to it.
*/
function apply_filters( $tag, $value ) {
global $wp_filter, $wp_current_filter;
$args = array();
// Do 'all' actions first.
if ( isset( $wp_filter['all'] ) ) {
$wp_current_filter[] = $tag;
$args = func_get_args();
_wp_call_all_hook( $args );
}
if ( ! isset( $wp_filter[ $tag ] ) ) {
if ( isset( $wp_filter['all'] ) ) {
array_pop( $wp_current_filter );
}
return $value;
}
if ( ! isset( $wp_filter['all'] ) ) {
$wp_current_filter[] = $tag;
}
if ( empty( $args ) ) {
$args = func_get_args();
}
// don't pass the tag name to WP_Hook
array_shift( $args );
$filtered = $wp_filter[ $tag ]->apply_filters( $value, $args );
array_pop( $wp_current_filter );
return $filtered;
}
/**
* Execute functions hooked on a specific filter hook, specifying arguments in an array.
*
* @since 3.0.0
*
* @see apply_filters() This function is identical, but the arguments passed to the
* functions hooked to `$tag` are supplied using an array.
*
* @g