Summery Summery

Combine user attributes with known attributes and fill in defaults when needed.

Syntax Syntax

shortcode_atts( array $pairs, array $atts, string $shortcode = '' )

Description Description

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.

Parameters Parameters


(Required) Entire list of supported attributes and their defaults.


(Required) User defined attributes in shortcode tag.


(Optional) The name of the shortcode, provided for context to enable filtering

Default value: ''

Return Return

(array) Combined and filtered attribute list.

Source Source

File: wp-includes/shortcodes.php

function shortcode_atts( $pairs, $atts, $shortcode = '' ) {
	$atts = (array) $atts;
	$out  = array();
	foreach ( $pairs as $name => $default ) {
		if ( array_key_exists( $name, $atts ) ) {
			$out[ $name ] = $atts[ $name ];
		} else {
			$out[ $name ] = $default;

	if ( $shortcode ) {
		 * Filters shortcode attributes.
		 * If the third parameter of the shortcode_atts() function is present then this filter is available.
		 * The third parameter, $shortcode, is the name of the shortcode.
		 * @since 3.6.0
		 * @since 4.4.0 Added the `$shortcode` parameter.
		 * @param array  $out       The output array of shortcode attributes.
		 * @param array  $pairs     The supported attributes and their defaults.
		 * @param array  $atts      The user defined shortcode attributes.
		 * @param string $shortcode The shortcode name.
		$out = apply_filters( "shortcode_atts_{$shortcode}", $out, $pairs, $atts, $shortcode );

	return $out;


Changelog Changelog

Version Description
2.5.0 Introduced.


Leave a Reply