function maxnum($n, $len) { if ($len == 0) { return 0; } return max($n[$len], maxnum($n, $len - 1)); }
<?php /** * Created by PhpStorm. * User: TMJoker * Date: 2016/4/26 * Time: 16:57 */ function maxnum($a, $b, $c) { return $a > $b ? $a > $c ? $a : $c : ($b > $c ? $b : $c); } echo maxnum(23, 14, 53) . "<br/>"; $num = 10; function multiply($num) { return $num = $num * 10; } echo multiply($num); echo $num;