How to get a nice list of all hooked functions in WordPress?

The following code is very useful when debugging or fiddling around with hook priorities. Knowing what’s hooked into wp_head() in what order is important, and this function is a great asset!

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;
}

 

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Mariusz Szatkowski
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