/** * 产生随机字符串 * * 产生一个指定长度的随机字符串,并返回给用户 * * @access public * @param int $len 产生字符串的位数 * @return string */ function randstr($len=6) { $chars='ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz0123456789-@#~'; // characters to build the password from mt_srand((double)microtime()*1000000*getmypid()); // seed the random number generater (must be done) $password=''; while(strlen($password)<$len) $password.=substr($chars,(mt_rand()%strlen($chars)),1); return $password; }