Find a deep array value given the path as an array. Please tell me this isn't the most efficient way...

test.php

<?php

function find_it($key)
{
	$preserve_key = $key;
	$txt['first']['second']['third']['end'] = 'yay!';

	$search = $txt;

	while (($part = array_shift($key)) && isset($search[$part]))
		$search = $search[$part];

	if (is_string($search))
		echo 'Found: ' . $search . '<br />';
	else
		echo 'Did not find: ' . implode('+', $preserve_key) . '<br />';
}

find_it(array('first', 'second', 'third', 'end'));
find_it(array('first', 'second', 'third', 'end2'));

/*
Outputs:

Found: yay!
Did not find: first+second+third+end2
*/