PHP - in_array equivalent for recursive arrays (containing stdClass objects)

gistfile1.php

<?php

function in_array_r($needle, $haystack) {
    $found = false;
    foreach ($haystack as $item) {
    if ($item === $needle) { 
            $found = true; 
            break; 
        } elseif (is_array($item)) {
            $found = in_array_r($needle, $item); 
            if($found) { 
                break; 
            } 
        }    
    }
    return $found;
}

?>

Seems like you should also be able to do this with array_map() or one of the other functions called recursively.