パスワード生成

<?php

function makePassword($length = 8)
{
$allowed_symbols = "23456789abcdeghkmnpqsuvxyz";
$allowed_symbols .= "ABCDEFGHJKLMNPQRSTUVWXYZ";

$password = ";
for($i=0; $i<$length; $i++)
{
$password .= $allowed_symbols{mt_rand(0, strlen($allowed_symbols)-1)};
}
return $password;
}

print_r(makePassword()."n");