生成随机数

php代码

<?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;