List All Currently Hooked WordPress Functions

list-hooked-functions.php

<?php //* mind this opening php tag

/**
 * This snippet returns a list of all currently hooked functions.
 * It is set up to output this data on a specific page. Do not output this data publicly.
 * Use this snippet for debugging/testing/development.
 * Source: http://www.rarst.net/wordpress/debug-wordpress-hooks/
 * Modified by Ren Ventura, EngageWP.com
**/

//* Define the function to be called
function list_hooked_functions($tag=false){

	global $wp_filter;
	
	if ($tag) {
		$hook[$tag]=$wp_filter[$tag];
		if (!is_array($hook[$tag])) {
			trigger_error("Nothing found for '$tag' hook", E_USER_WARNING);
			return;
		}
	} else {
		$hook=$wp_filter;
		ksort($hook);
	}
	
	echo '<pre>';

	foreach($hook as $tag => $priority){

		echo "<br />&gt;&gt;&gt;&gt;&gt;\t<strong>$tag</strong><br />";

		ksort($priority);

		foreach($priority as $priority => $function){

			echo $priority;

			foreach($function as $name => $properties) echo "\t$name<br />";

		}

	}

	echo '</pre>';

	return;

}

//* Replace the content of a test page with the output of the function
add_filter( 'the_content', 'rv_print_hooked_functions' );
function rv_print_hooked_functions( $content ) {
	// Replace 46 with the ID of your own test page (do not make this page visible to the public)
	if ( is_page( 46 ) ) {
		// Replace 'admin_notices" with the hook you want to test or remove for viewing all hooked functions
		$content = list_hooked_functions( 'admin_notices' );
	}
	return $content;
}