Finding post depth in WordPress

find-post-depth.php

function find_post_depth() {
	global $post;
	$parent = 0;
	$level = 1;
	if ($post->post_parent) {
		$parent = get_post($post->post_parent);
		$parents_parent = get_post($parent->post_parent);
		$parent_of_parents_parent = get_post($parents_parent->post_parent);
	} else {
		return $level;
	}

	// if the parent post has no parent we are at level two
	if ($parent->post_parent == false) {
		$level = 2;
	// if the parent of the parent post has no parent we are level three
	} elseif ($parents_parent->post_parent == false) {
		$level = 3;
	// if the parent of the parent posts parent has no parent we are at level four
	} elseif ($parent_of_parents_parent->post_parent == false) {
		$level = 4;
	} else {
		$level = 0; // anything over 4 levels
	}

	return $level;
}