Where Can I Download a Password Program for my site membership?

I'm looking for a program that can randomly generate passwords for each member who signs up to my site. Does anyone know of a good program?

 

This little function that can generate a completely random password.


<?php

/**
* The letter l (lowercase L) and the number 1
* have been removed, as they can be mistaken
* for each other.
*/

function createRandomPassword() {

$chars = "abcdefghijkmnopqrstuvwxyz023456789";
srand((double)microtime()*1000000);
$i = 0;
$pass = '' ;

while ($i <= 7) {
$num = rand() % 33;
$tmp = substr($chars, $num, 1);
$pass = $pass . $tmp;
$i++;
}

return $pass;

}

// Usage
$password = createRandomPassword();
echo "Your random password is: $password";

?>

http://www.totallyphp.co.uk/code/create_a_random_password.htm