Helper functions for developing and debugging WordPress plugins and themes

check-hooked-actions-filters.php

/**
 * Prints all actions and filters hooked to a given hook.
 * 
 * Prints all actions and filters hooked to a given hook.
 * Inspired by answers in this WordPress Stackexchange question: https://wordpress.stackexchange.com/questions/17394/how-to-know-what-functions-are-hooked-to-an-action-filter
 */

function what_is_hooked(){
	$hook_name = current_filter();
	global $wp_filter;
	echo '<pre>';
	print_r( $wp_filter[$hook_name], true );
	echo '</pre>';
}
// Now you add it to the hook you want to check. e.g. wp_head
add_action( 'wp_head', 'what_is_hooked', 999);

/**
 * Logs all actions and filters hooked to a given hook.
 * 
 * Logs all actions and filters hooked to a given hook.
 * Inspired by answers in this WordPress Stackexchange question: https://wordpress.stackexchange.com/questions/17394/how-to-know-what-functions-are-hooked-to-an-action-filter
 */
function log_what_is_hooked(){
	$hook_name = current_filter();
	global $wp_filter;
	error_log( print_r( $wp_filter[$hook_name], true ) );
}
// Now you add it to the hook you want to check. e.g. wp_head
add_action( 'wp_head', 'log_what_is_hooked', 999);