PHP Hash test for Tweakers.net

<?php
function tryLogin($user, $username, $password)
{
    $encryptions = hash_algos(); // 2 = md5

    if($username == $user['username'])
    {
        $hash = explode('$', $user['password']);
        array_shift($hash);
        list($encIndex, $salt, $passwordhash) = $hash;
        $encryption = $encryptions[$encIndex]; // md5
        $newPassword = '';
        if($encryption == 'md5')
            $newPassword = md5($salt . $password);
        $newHash = '$' . $encIndex . '$' . $salt . '$' . $newPassword;
        echo $newHash . '<br />';
        if($user['password'] == $newHash)
            return true;
    }
    return false;
}

function createUser($username, $password)
{
    $salt = uniqid();
    $hash = '$2$' . $salt . '$' . md5($salt . $password);
    return array('username' => $username, 'password' => $hash);
}

$user = createUser('Erwin', 'Erwin');
$wrong = tryLogin($user, 'Erwin', 'Erwintje'); // boolean false
$good = tryLogin($user, 'Erwin', 'Erwin'); // boolean true
?>