[ticket/10328] Added a JSON class.

The JSON class adds a consistent way to send JSON to the client, making
it perfect for AJAX (jQuery automatically parses it).

PHPBB3-10328

phpBB/includes/json.php

@@ -0,0 +1,59 @@
+<?php
+/**
+*
+* @package phpBB3
+* @version $Id$
+* @copyright (c) 2005 phpBB Group
+* @license http://opensource.org/licenses/gpl-license.php GNU Public License
+*
+*/
+
+/**
+* @ignore
+*/
+if (!defined('IN_PHPBB'))
+{
+	exit;
+}
+
+/**
+* JSON class
+* @package phpBB3
+*/
+class JSON
+{
+	private static $data = array();
+
+	/**
+	 * Send the data to the client and exit the script.
+	 *
+	 * @param array $data Any additional data to send.
+	 * @param bool $exit Will exit the script if true.
+	 */
+	public static function send($data = false, $exit = true)
+	{
+		if ($data)
+		{
+			self::add($data);
+		}
+
+		header('Content-type: application/json');
+		echo json_encode(self::$data);
+
+		if ($exit)
+		{
+			garbage_collection();
+			exit_handler();
+		}
+	}
+
+	/**
+	 * Saves some data to be written when JSON::send() is called.
+	 *
+	 * @param array $data Data to save to be sent.
+	 */
+	public static function add($data)
+	{
+		self::$data = array_merge(self::$data, $data);
+	}
+}