Online PHP editor | refs for nvZKa

@ 2014-03-25T18:13:38Z

<?php
/*function rev($str) {
    if ( ! $str ) {
        return;
    }
    return rev(substr($str,1)) . $str{0};
}*/

function sum($arr) {
    if ( empty($arr) ) {
		return;
    }
    return $arr[0] + sum(array_slice($arr,1));
}

$a = array(5,4,7,8,9,3);
echo sum($a);