<?php /** *生成随机数 *@param */ function randstr($m = 5) { $new_str = ''; $str = 'abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwsyz0123456789'; for ($i = 1; $i <= $m; ++$i) { $new_str .=$str[mt_rand(0, 61)]; } return $new_str; } //测试 $str = randstr(6); echo $str;