Checks if a value exists in an array

gistfile1.php

<?php
/**
 * Checks if a value exists in an array
 * 
 * @param mixed $needle The value sought
 * @param array $haystack The array that will be verified
 * @return boolean
 * 
 * */
function in_multiarray($needle, $haystack)
{
    $top = sizeof($haystack) - 1;
    $bottom = 0;

    while ($bottom <= $top) {
        if ($haystack[$bottom] == $needle) {
            return true;
        } else {
            if (is_array($haystack[$bottom])) {
                if (in_multiarray($needle, ($haystack[$bottom]))) {
                    return true;
                }
            }
        }
        $bottom++;
    }

    return false;
}