增加使用media id发送图文消息的功能

src/Wechat/Message.php

@@ -34,6 +34,7 @@ class Message
     const NEWS      = 'news';
     const TRANSFER  = 'transfer';
     const NEWS_ITEM = 'news_item';
+    const MP_NEWS = 'mp_news';
 
     /**
      * 创建消息实例

src/Wechat/Messages/MpNews.php

@@ -0,0 +1,78 @@
+<?php
+/**
+ * Image.php
+ *
+ * Part of Overtrue\Wechat.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @author    overtrue <i@overtrue.me>
+ * @copyright 2015 overtrue <i@overtrue.me>
+ * @link      https://github.com/overtrue
+ * @link      http://overtrue.me
+ */
+
+namespace Overtrue\Wechat\Messages;
+
+use Overtrue\Wechat\Media;
+
+/**
+ * 多图文消息
+ *
+ * @property string $media_id
+ */
+class MpNews extends BaseMessage
+{
+
+    /**
+     * 属性
+     *
+     * @var array
+     */
+    protected $properties = array('media_id');
+
+    /**
+     * 设置Media_id
+     *
+     * @param string $mediaId
+     *
+     * @return Image
+     */
+    public function media($mediaId)
+    {
+        $this->setAttribute('media_id', $mediaId);
+
+        return $this;
+    }
+
+    /**
+     * 生成主动消息数组
+     *
+     * @return array
+     */
+    public function toStaff()
+    {
+        return array(
+                'mpnews' => array(
+                            'media_id' => $this->media_id,
+                           ),
+               );
+    }
+
+    /**
+     * 生成回复消息数组
+     *
+     * @return array
+     */
+    public function toReply()
+    {
+        throw new Exception(__CLASS__.'未实现此方法：toReply()');
+        /*return array(
+                'Image' => array(
+                            'MediaId' => $this->media_id,
+                           ),
+               );
+        */
+    }
+}