adi

	function bookRentCars($car_id){
		$now = time();
		$newRetTime = $now + (3 * 60);
		$servername = 'localhost';
		$username = 'root';
		$password = '';
		$dbname = 'soa';
		$conn = new mysqli($servername, $username, $password, $dbname);
		if($conn->connect_error){
			die("Connection failed : ".$conn->connect_error);
		}
		$sql = "UPDATE `rentcars` SET `avail`=0,`ret_time`='$newRetTime' WHERE car_id = '$car_id'";
		if (mysqli_query($conn, $sql)) {
			$message = array('message' => "berhasil");
		} else {
			$message = array('message' => "gagal");
		}
		$conn->close();
		return 0;
	}