shortcode_atts() │ WP 2.5.0

Combine 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.

Hooks from the function

Return

Array. Combined and filtered attribute list.

Usage

shortcode_atts( $pairs, $atts, $shortcode );
$pairs(array) (required)
Entire list of supported attributes and their defaults.
$atts(array) (required)
User defined attributes in shortcode tag.
$shortcode(string)
The name of the shortcode, provided for context to enable filtering
Default: ''

Changelog

Since 2.5.0 Introduced.

Code of shortcode_atts() WP 5.9.3

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;
}

Shortcodes