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<?php
/**
* WordPress API for creating bbcode-like tags or what WordPress calls
* "shortcodes". The tag and attribute parsing or regular expression code is
* based on the Textpattern tag parser.
*
* A few examples are below:
*
* [shortcode /]
* [shortcode foo="bar" baz="bing" /]
* [shortcode foo="bar"]content[/shortcode]
*
* Shortcode tags support attributes and enclosed content, but does not entirely
* support inline shortcodes in other shortcodes. You will have to call the
* shortcode parser in your function to account for that.
*
* {@internal
* Please be aware that the above note was made during the beta of WordPress 2.6
* and in the future may not be accurate. Please update the note when it is no
* longer the case.}}
*
* To apply shortcode tags to content:
*
* $out = do_shortcode( $content );
*
* @link https://developer.wordpress.org/plugins/shortcodes/
*
* @package WordPress
* @subpackage Shortcodes
* @since 2.5.0
*/
/**
* Container for storing shortcode tags and their hook to call for the shortcode.
*
* @since 2.5.0
*
* @name $shortcode_tags
* @var array
* @global array $shortcode_tags
*/
$shortcode_tags = array();
/**
* Adds a new shortcode.
*
* Care should be taken through prefixing or other means to ensure that the
* shortcode tag being added is unique and will not conflict with other,
* already-added shortcode tags. In the event of a duplicated tag, the tag
* loaded last will take precedence.
*
* @since 2.5.0
*
* @global array $shortcode_tags
*
* @param string $tag Shortcode tag to be searched in post content.
* @param callable $callback The callback function to run when the shortcode is found.
* Every shortcode callback is passed three parameters by default,
* including an array of attributes (`$atts`), the shortcode content
* or null if not set (`$content`), and finally the shortcode tag
* itself (`$shortcode_tag`), in that order.
*/
function add_shortcode( $tag, $callback ) {
global $shortcode_tags;
if ( '' === trim( $tag ) ) {
_doing_it_wrong(
__FUNCTION__,
__( 'Invalid shortcode name: Empty name given.' ),
'4.4.0'
);
return;
}
if ( 0 !== preg_match( '@[<>&/\[\]\x00-\x20=]@', $tag ) ) {
_doing_it_wrong(
__FUNCTION__,
sprintf(
/* translators: 1: Shortcode name, 2: Space-separated list of reserved characters. */
__( 'Invalid shortcode name: %1$s. Do not use spaces or reserved characters: %2$s' ),
$tag,
'& / < > [ ] ='
),
'4.4.0'
);
return;
}
$shortcode_tags[ $tag ] = $callback;
}
/**
* Removes hook for shortcode.
*
* @since 2.5.0
*
* @global array $shortcode_tags
*
* @param string $tag Shortcode tag to remove hook for.
*/
function remove_shortcode( $tag ) {
global $shortcode_tags;
unset( $shortcode_tags[ $tag ] );
}
/**
* Clears all shortcodes.
*
* This function clears all of the shortcode tags by replacing the shortcodes global with
* an empty array. This is actually an efficient method for removing all shortcodes.
*
* @since 2.5.0
*
* @global array $shortcode_tags
*/
function remove_all_shortcodes() {
global $shortcode_tags;
$shortcode_tags = array();
}
/**
* Determines whether a registered shortcode exists named $tag.
*
* @since 3.6.0
*
* @global array $shortcode_tags List of shortcode tags and their callback hooks.
*
* @param string $tag Shortcode tag to check.
* @return bool Whether the given shortcode exists.
*/
function shortcode_exists( $tag ) {
global $shortcode_tags;
return array_key_exists( $tag, $shortcode_tags );
}
/**
* Determines whether the passed content contains the specified shortcode.
*
* @since 3.6.0
*
* @global array $shortcode_tags
*
* @param string $content Content to search for shortcodes.
* @param string $tag Shortcode tag to check.
* @return bool Whether the passed content contains the given shortcode.
*/
function has_shortcode( $content, $tag ) {
if ( ! str_contains( $content, '[' ) ) {
return false;
}
if ( shortcode_exists( $tag ) ) {
preg_match_all( '/' . get_shortcode_regex() . '/', $content, $matches, PREG_SET_ORDER );
if ( empty( $matches ) ) {
return false;
}
foreach ( $matches as $shortcode ) {
if ( $tag === $shortcode[2] ) {
return true;
} elseif ( ! empty( $shortcode[5] ) && has_shortcode( $shortcode[5], $tag ) ) {
return true;
}
}
}
return false;
}
/**
* Returns a list of registered shortcode names found in the given content.
*
* Example usage:
*
* get_shortcode_tags_in_content( '[audio src="file.mp3"][/audio] [foo] [gallery ids="1,2,3"]' );
* // array( 'audio', 'gallery' )
*
* @since 6.3.2
*
* @param string $content The content to check.
* @return string[] An array of registered shortcode names found in the content.
*/
function get_shortcode_tags_in_content( $content ) {
if ( false === strpos( $content, '[' ) ) {
return array();
}
preg_match_all( '/' . get_shortcode_regex() . '/', $content, $matches, PREG_SET_ORDER );
if ( empty( $matches ) ) {
return array();
}
$tags = array();
foreach ( $matches as $shortcode ) {
$tags[] = $shortcode[2];
if ( ! empty( $shortcode[5] ) ) {
$deep_tags = get_shortcode_tags_in_content( $shortcode[5] );
if ( ! empty( $deep_tags ) ) {
$tags = array_merge( $tags, $deep_tags );
}
}
}
return $tags;
}
/**
* Searches content for shortcodes and filter shortcodes through their hooks.
*
* This function is an alias for do_shortcode().
*
* @since 5.4.0
*
* @see do_shortcode()
*
* @param string $content Content to search for shortcodes.
* @param bool $ignore_html When true, shortcodes inside HTML elements will be skipped.
* Default false.
* @return string Content with shortcodes filtered out.
*/
function apply_shortcodes( $content, $ignore_html = false ) {
return do_shortcode( $content, $ignore_html );
}
/**
* Searches content for shortcodes and filter shortcodes through their hooks.
*
* If there are no shortcode tags defined, then the content will be returned
* without any filtering. This might cause issues when plugins are disabled but
* the shortcode will still show up in the post or content.
*
* @since 2.5.0
*
* @global array $shortcode_tags List of shortcode tags and their callback hooks.
*
* @param string $content Content to search for shortcodes.
* @param bool $ignore_html When true, shortcodes inside HTML elements will be skipped.
* Default false.
* @return string Content with shortcodes filtered out.
*/
function do_shortcode( $content, $ignore_html = false ) {
global $shortcode_tags;
if ( ! str_contains( $content, '[' ) ) {
return $content;
}
if ( empty( $shortcode_tags ) || ! is_array( $shortcode_tags ) ) {
return $content;
}
// Find all registered tag names in $content.
preg_match_all( '@\[([^<>&/\[\]\x00-\x20=]++)@', $content, $matches );
$tagnames = array_intersect( array_keys( $shortcode_tags ), $matches[1] );
if ( empty( $tagnames ) ) {
return $content;
}
// Ensure this context is only added once if shortcodes are nested.
$has_filter = has_filter( 'wp_get_attachment_image_context', '_filter_do_shortcode_context' );
$filter_added = false;
if ( ! $has_filter ) {
$filter_added = add_filter( 'wp_get_attachment_image_context', '_filter_do_shortcode_context' );
}
$content = do_shortcodes_in_html_tags( $content, $ignore_html, $tagnames );
$pattern = get_shortcode_regex( $tagnames );
$content = preg_replace_callback( "/$pattern/", 'do_shortcode_tag', $content );
// Always restore square braces so we don't break things like <!--[if IE ]>.
$content = unescape_invalid_shortcodes( $content );
// Only remove the filter if it was added in this scope.
if ( $filter_added ) {
remove_filter( 'wp_get_attachment_image_context', '_filter_do_shortcode_context' );
}
return $content;
}
/**
* Filter the `wp_get_attachment_image_context` hook during shortcode rendering.
*
* When wp_get_attachment_image() is called during shortcode rendering, we need to make clear