PHP生成随机字符 可做随机命名 随机卡密等

<?php
function randStr($len = 6)
{
    $chars = 'ABDEFGHJKLMNPQRSTVWXYabdefghijkmnpqrstvwxy23456789#%*';
    mt_srand((float) microtime() * 1000000 * getmypid());
    $password = '';
    while (strlen($password) < $len)
        $password .= substr($chars, (mt_rand() % strlen($chars)), 1);
    return $password;
}
echo randStr();
?>

<?php
header("Content-type:text/html;charset=utf-8");
function randStr($length = 6)
{
    $password = '';
    //将你想要的字符添加到下面字符串中，默认是数字0-9和26个英文字母
    $chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    $char_len = strlen($chars);
    for ($i = 0; $i < $length; $i++) {
        $loop = mt_rand(0, ($char_len - 1));
        //将这个字符串当作一个数组，随机取出一个字符，并循环拼接成你需要的位数
        $password .= $chars[$loop];
    }
    return $password;
}
echo randStr(12); //随机生成一个12位数的密码
?>