<?php
$conn = mysqli_connect('хост', 'юзер', 'пароль', 'база');
date_default_timezone_set('Europe/Moscow');
if (!$conn) exit('[CONNECTION ERROR]');

$nick = trim(htmlspecialchars(mysqli_real_escape_string($conn, $_POST['nick'])));
$server = trim(htmlspecialchars(mysqli_real_escape_string($conn, $_POST['server'])));
$hwid = trim(htmlspecialchars(mysqli_real_escape_string($conn, $_POST['hwid'])));

if (!empty($nick) & !empty($server) & !empty($hwid)) {
	$result = $conn->query("SELECT * FROM `accounts` WHERE `nick` = '".$nick."' AND `server` = '".$server."' AND `hwid` = '".$hwid."'");
    if (mysqli_num_rows($result) == 0) {
		$conn->query("INSERT INTO `accounts` (`server`, `nick`, `hwid`, `status`, `date`) VALUES ('" . $server . "', '" . $nick . "', '" . $hwid . "', '0' , '" . date('Y/m/d H:i:s') . "')");
		$status = array(
			"status" => "added"
		);
		echo json_encode( $status );
	} else {
		$result_get_status = $conn->query("SELECT * FROM `accounts` WHERE `nick` = '".$nick."' AND `server` = '".$server."' AND `hwid` = '".$hwid."' AND `status` = '1'");
		if (mysqli_num_rows($result_get_status) == 1) {
			$status = array(
				"status" => "1"
			);
			echo json_encode( $status );
		} else {
			$status = array(
				"status" => "0"
			);
			echo json_encode( $status );
		}
		$result_get_status->close();
	}
	$result->close();
} else {
	echo "Не введены данные";
}
$conn->close();
?>