利用此函数生成随机文件名或强度较高的卡密等第一种:123456789101112<?phpfunction 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 $password;}echo randStr();?>第二种:1234567891011121314151617<?phpheader("Content-type:text/html;charset=utf-8");function randStr($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?>