PHP产生随机字符串函数

<?php

/**

• 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='ABDEFGHJKLMNPQRSTVWXYabdefghijkmnpqrstvwxy23456789#%'; // characters to build the password from
  mt_srand((double)microtime()1000000getmypid()); // seed the random number generater (must be done)
  $password='';
  while(strlen($password)<$len)
  $password.=substr($chars,(mt_rand()%strlen($chars)),1);
  return $password;
  }

?>