PHP亂數產生字串

function randStr($len=6)
{
$chars='ABDEFGHJKLMNPQRSTVWXYabdefghijkmnpqrstvwxy23456789#%*';
// 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;
}


http://www.jb51.net/article/5115.htm