Checks through recursion, a list of keys that have a value EMPTY or NULL

gistfile1.php

<?php
/**
 * Checks through recursion, a list of keys that have a value EMPTY or NULL
 * 
 * @param array $haystack A simple/multi-dimensional array
 * @param string $mandatory List with the names of keys that will be checked, separated by commas
 * @return boolean
 * 
 * */
function is_arrayEmpty($haystack, $mandatory = null)
{
    foreach ($haystack as $k => $v) {
        if (is_array($v)) {
            is_arrayEmpty($v, $mandatory);
        } else {
            if (in_array($k, preg_split('~[\s,]+~', $mandatory)) && $v == '') {
                return true;
            }
        }
    }
}