生成sessionid和随机密码的例子
用这个可以来验证用户和生成随机密码--teaman
<?
//----------------------------------------------------
// function getsid()
//
// parameters : $nsize number of caracters, default 24
// return value : 24 caracters string
//
// description : this function returns a random string
// of 24 caracters that can be used to identify users
// on your web site in a more secure way. you can also
// use this function to generate passwords.
//----------------------------------------------------
function getsid ($nsize=24) {
// randomize
mt_srand ((double) microtime() * 1000000);
for ($i=1; $i<=$nsize; $i++) {
// if you wish to add numbers in your string,
// uncomment the two lines that are commented
// in the if statement
$nrandom = mt_rand(1,30);
if ($nrandom <= 10) {
// uppercase letters
$sessionid .= chr(mt_rand(65,90));
// } elseif ($nrandom <= 20) {
// $sessionid .= mt_rand(0,9);
} else {
// lowercase letters
$sessionid .= chr(mt_rand(97,122));
}
}
return $sessionid;
}
// test the function
echo getsid(16);
?>
