apply_filters_ref_array() WP 1.0

Execute functions hooked on a specific filter hook, specifying arguments in an array.

No Hooks.

Return

Mixed. The filtered value after all hooked functions are applied to it.

Usage

apply_filters_ref_array( $tag, $args );

$tag(string) (required)

The name of the filter hook.

$args(array) (required)

The arguments supplied to the functions hooked to $tag.

Code of apply filters ref array: wp-includes/plugin.php ^{WP 5.2.1}

<?php
function apply_filters_ref_array( $tag, $args ) {
	global $wp_filter, $wp_current_filter;

	// Do 'all' actions first
	if ( isset( $wp_filter['all'] ) ) {
		$wp_current_filter[] = $tag;
		$all_args            = func_get_args();
		_wp_call_all_hook( $all_args );
	}

	if ( ! isset( $wp_filter[ $tag ] ) ) {
		if ( isset( $wp_filter['all'] ) ) {
			array_pop( $wp_current_filter );
		}
		return $args[0];
	}

	if ( ! isset( $wp_filter['all'] ) ) {
		$wp_current_filter[] = $tag;
	}

	$filtered = $wp_filter[ $tag ]->apply_filters( $args[0], $args );

	array_pop( $wp_current_filter );

	return $filtered;
}

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