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/wp-includes/ -> shortcodes.php (summary)

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:

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Defines 18 functions

  add_shortcode()
  remove_shortcode()
  remove_all_shortcodes()
  shortcode_exists()
  has_shortcode()
  get_shortcode_tags_in_content()
  apply_shortcodes()
  do_shortcode()
  _filter_do_shortcode_context()
  get_shortcode_regex()
  do_shortcode_tag()
  do_shortcodes_in_html_tags()
  unescape_invalid_shortcodes()
  get_shortcode_atts_regex()
  shortcode_parse_atts()
  shortcode_atts()
  strip_shortcodes()
  strip_shortcode_tag()

Functions
Functions that are not part of a class:

add_shortcode( $tag, $callback )   X-Ref
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.

param: string   $tag      Shortcode tag to be searched in post content.
param: callable $callback The callback function to run when the shortcode is found.

remove_shortcode( $tag )   X-Ref
Removes hook for shortcode.

param: string $tag Shortcode tag to remove hook for.

remove_all_shortcodes()   X-Ref
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.


shortcode_exists( $tag )   X-Ref
Determines whether a registered shortcode exists named $tag.

param: string $tag Shortcode tag to check.
return: bool Whether the given shortcode exists.

has_shortcode( $content, $tag )   X-Ref
Determines whether the passed content contains the specified shortcode.

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.

get_shortcode_tags_in_content( $content )   X-Ref
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' )

param: string $content The content to check.
return: string[] An array of registered shortcode names found in the content.

apply_shortcodes( $content, $ignore_html = false )   X-Ref
Searches content for shortcodes and filter shortcodes through their hooks.

This function is an alias for do_shortcode().

param: string $content     Content to search for shortcodes.
param: bool   $ignore_html When true, shortcodes inside HTML elements will be skipped.
return: string Content with shortcodes filtered out.

do_shortcode( $content, $ignore_html = false )   X-Ref
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.

param: string $content     Content to search for shortcodes.
param: bool   $ignore_html When true, shortcodes inside HTML elements will be skipped.
return: string Content with shortcodes filtered out.

_filter_do_shortcode_context()   X-Ref
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
that the context is a shortcode and not part of the theme's template rendering logic.

return: string The filtered context value for wp_get_attachment_images when doing shortcodes.

get_shortcode_regex( $tagnames = null )   X-Ref
Retrieves the shortcode regular expression for searching.

The regular expression combines the shortcode tags in the regular expression
in a regex class.

The regular expression contains 6 different sub matches to help with parsing.

1 - An extra [ to allow for escaping shortcodes with double [[]]
2 - The shortcode name
3 - The shortcode argument list
4 - The self closing /
5 - The content of a shortcode when it wraps some content.
6 - An extra ] to allow for escaping shortcodes with double [[]]

param: array $tagnames Optional. List of shortcodes to find. Defaults to all registered shortcodes.
return: string The shortcode search regular expression

do_shortcode_tag( $m )   X-Ref
Regular Expression callable for do_shortcode() for calling shortcode hook.

param: array $m {
return: string Shortcode output.

do_shortcodes_in_html_tags( $content, $ignore_html, $tagnames )   X-Ref
Searches only inside HTML elements for shortcodes and process them.

Any [ or ] characters remaining inside elements will be HTML encoded
to prevent interference with shortcodes that are outside the elements.
Assumes $content processed by KSES already.  Users with unfiltered_html
capability may get unexpected output if angle braces are nested in tags.

param: string $content     Content to search for shortcodes.
param: bool   $ignore_html When true, all square braces inside elements will be encoded.
param: array  $tagnames    List of shortcodes to find.
return: string Content with shortcodes filtered out.

unescape_invalid_shortcodes( $content )   X-Ref
Removes placeholders added by do_shortcodes_in_html_tags().

param: string $content Content to search for placeholders.
return: string Content with placeholders removed.

get_shortcode_atts_regex()   X-Ref
Retrieves the shortcode attributes regex.

return: string The shortcode attribute regular expression.

shortcode_parse_atts( $text )   X-Ref
Retrieves all attributes from the shortcodes tag.

The attributes list has the attribute name as the key and the value of the
attribute as the value in the key/value pair. This allows for easier
retrieval of the attributes, since all attributes have to be known.

param: string $text Shortcode arguments list.
return: array Array of attribute values keyed by attribute name.

shortcode_atts( $pairs, $atts, $shortcode = '' )   X-Ref
Combines user attributes with known attributes and fill in defaults when needed.

The pairs should be considered to be all of the attributes which are
supported by the caller and given as a list. The returned attributes will
only contain the attributes in the $pairs list.

If the $atts list has unsupported attributes, then they will be ignored and
removed from the final returned list.

param: array  $pairs     Entire list of supported attributes and their defaults.
param: array  $atts      User defined attributes in shortcode tag.
param: string $shortcode Optional. The name of the shortcode, provided for context to enable filtering
return: array Combined and filtered attribute list.

strip_shortcodes( $content )   X-Ref
Removes all shortcode tags from the given content.

param: string $content Content to remove shortcode tags.
return: string Content without shortcode tags.

strip_shortcode_tag( $m )   X-Ref
Strips a shortcode tag based on RegEx matches against post content.

param: array $m RegEx matches against post content.
return: string|false The content stripped of the tag, otherwise false.



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