validation.php

<?php
if (!empty($_REQUEST['u'])){
	$usernames = array("adyanf", "adyanaufalF", "adyanaufalfikri");
	$toCheck = $_REQUEST['u'];
	if (in_array($toCheck, $usernames)){
	echo "false";
	}
	else {
		echo "true";
	}
}

if (!empty($_REQUEST['e'])){
	$emails = array("adyanaufalf@gmail.com", "adyanaufalfikri@gmail.com", "13515130@std.stei.itb.ac.id");
	$toCheck = $_REQUEST['e'];
	if (in_array($toCheck, $emails)){
		echo "false";
	}
	else {
		echo "true";
	}
}

?>