if ( isset($_POST[$formName]) ) {

        $user	= trim(htmlentities($_POST['user']));
	$email	= trim(htmlentities($_POST['email']));


	if (empty($user) && empty($email)) { // check that the form field is not empty
		$msg = $error['blank_fields'];
	}

	if (!$msg && checkEmail($email) == FALSE ) { // check the email
		$msg = $error['email_invalid'];
	}

	//...
	//...

	if (!$msg) {
		$msg = 'awesome';
	}
    }