mysqlの情報をjson出力

URLクエリとしてidをもらって、そのidに関する情報を出力

<?php

$db_sever = "DB Server domain";
$user_name = "user name";
$password = "password";
$db_name = "database name";
$table_name = "table name";

$encode = array();

if(isset($_GET['id'])){

	$mysqli = new mysqli($db_sever, $user_name, $password, $db_name);
	if (mysqli_connect_error()) {
		die('Connect Error (' . mysqli_connect_errno() . ') '
				. mysqli_connect_error());
	}

	if ($result = $mysqli->query("SELECT id,name,twitter_name FROM checker_broadcaster" . " limit 1 OFFSET " . ($_GET['id'] - 1))) {
		while ($row = mysqli_fetch_assoc($result)) {
			$encode[] = $row;
		}
		echo json_encode($encode); 
		$result->close();
	}

	$mysqli->close();
}