PHP自动生成随机密码

lujiguo115

<?php
function rand_string($len = 16, $keyword = '') {
if (strlen($keyword) > $len) {//关键字不能比总长度长
return false;
}
$str = '';
$chars = 'abcdefghijkmnpqrstuvwxyz23456789ABCDEFGHIJKMNPQRSTUVWXYZ'; //去掉1跟字母l防混淆            
if ($len > strlen($chars)) {//位数过长重复字符串一定次数
$chars = str_repeat($chars, ceil($len / strlen($chars)));
}
$chars = str_shuffle($chars); //打乱字符串
$str = substr($chars, 0, $len);
if (!empty($keyword)) {
$start = $len - strlen($keyword);
$str = substr_replace($str, $keyword, mt_rand(0, $start), strlen($keyword)); //从随机位置插入关键字
}
return $str;
}
echo rand_string(16,"ab"); //output example:V8bNY6SmkeywordB
?>