array_path

<?php

function array_path($arr, $val, $strict = false) {
    foreach($arr as $k => $v)
        if(is_array($v)) {
            $t = array_path($v, $val, $strict);
            if($t !== null)
                return array_merge(array($k), $t);
        } elseif((!$strict && $v == $val) && $v === $val) {
            return array($k);
        }

    return null;
}

$arr = array(
    'foo' => 'bar',
    'baz' => array(
        'test' => 42,
        'here' => array(
            'is' => array(
                'the' => 'path'
            )
        ),
        'wrong' => 'turn'
    )
);

print_r(array_path($arr, "path"));
?>