PHP Recursive Array Search

recursive_array_search.php

<?php

/**
 * Recursively search an array for a given value. Returns the root element key if $needle
 * is found, or FALSE if $needle cannot be found.
 *
 * @param	mixed	$needle
 * @param	array	$haystack
 * @param	bool	$strict
 * @return	mixed|bool
 * @author  Joseph Wynn <joseph@wildlyinaccurate.com>
 */
function recursive_array_search($needle, $haystack, $strict = true)
{
	$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($haystack), RecursiveIteratorIterator::SELF_FIRST);

	while ($iterator->valid())
	{
		if ($iterator->getDepth() === 0)
		{
			$current_key = $iterator->key();
		}

		if ($strict && $iterator->current() === $needle)
		{
			return $current_key;
		}
		elseif ($iterator->current() == $needle)
		{
			return $current_key;
		}

		$iterator->next();
	}

	return false;
}