PHP WeChat development: How to implement graphic and text replies

As one of the hottest applications in social media, WeChat has attracted the attention of many companies and developers. Among them, image and text replies are one of the most common requirements in WeChat applications. If you are using PHP for WeChat development and want to implement graphic and text replies, this article will help you solve this problem.

1. Understand the message types of WeChat public platform

Before we start to introduce how to implement graphic and text replies in PHP, we need to first understand the message types of WeChat public platform. The message types on the WeChat public platform mainly include the following:

1. Text message (text)
2. Picture message (image)
3. Voice message (voice)
4. Video message (video)
5. Short video message (short video)
6. Geographical location message (location)
7. Link message (link)
8. Event message (event)

Among them, what we need to use are event messages and graphic messages.

2. Implement event messages

Event messages refer to the fact that after a user performs a certain behavior on the official account, the official account will receive an event push message. This includes many types of events, such as follow events, click menu events, QR code scanning events, etc.

In PHP, processing event messages requires parsing the received message first to determine the message type, and then handle it accordingly. The code is as follows:

$postData = $GLOBALS['HTTP_RAW_POST_DATA'];
$postObj = simplexml_load_string($postData, "SimpleXMLElement", LIBXML_NOCDATA);

$MsgType = trim($postObj->MsgType);
if ($MsgType == 'event') {
    $Event = trim($postObj->Event);
    switch ($Event) {
        case 'subscribe'://关注事件
            //TODO 你的处理逻辑
            break;
        case 'unsubscribe'://取消关注事件
            //TODO 你的处理逻辑
            break;
        case 'CLICK'://自定义菜单点击事件
            //TODO 你的处理逻辑
            break;
        case 'VIEW'://自定义菜单跳转事件
            //TODO 你的处理逻辑
            break;
        case 'SCAN'://扫码事件
            //TODO 你的处理逻辑
            break;
        case 'LOCATION'://地理位置事件
            //TODO 你的处理逻辑
            break;
        case 'TEMPLATESENDJOBFINISH'://模板消息发送完成事件
            //TODO 你的处理逻辑
            break;
        default:
            break;
    }
}

3. Implement graphic and text messages

After understanding the event message, next we focus on the implementation of graphic and text messages. Graphic messaging refers to the way public accounts transmit information by sending a set of graphic messages to users. In PHP, to implement graphic messages, you need to first prepare the graphic information to be sent, and then call the WeChat public platform interface to convert the data into XML format before sending. The code is as follows:

function sendNews($object, $newsArray)
{
    $itemTpl = "<item>
    <Title><![CDATA[%s]]></Title>
    <Description><![CDATA[%s]]></Description>
    <PicUrl><![CDATA[%s]]></PicUrl>
    <Url><![CDATA[%s]]></Url>
    </item>";

    $itemStr = "";
    foreach ($newsArray as $item) {
        $itemStr .= sprintf($itemTpl, $item['Title'], $item['Description'], $item['PicUrl'], $item['Url']);
    }

    $xmlTpl = "<xml>
     <ToUserName><![CDATA[%s]]></ToUserName>
     <FromUserName><![CDATA[%s]]></FromUserName>
     <CreateTime>%s</CreateTime>
     <MsgType><![CDATA[news]]></MsgType>
     <ArticleCount>%s</ArticleCount>
     <Articles>
     $itemStr</Articles>
     </xml>";

     $result = sprintf($xmlTpl, $object->FromUserName, $object->ToUserName, $time, count($newsArray));

     return $result;
}

The above function converts the graphic message data into XML format and returns it. It should be noted that different message types require different XML formats. When sending a text message, you need to change the message type to text and the message body from Articles to Content.

4. Implementation steps of graphic messages

1. Configure the interface address in the WeChat public platform
In the WeChat public platform, you need to configure your own server interface address to the public platform , and connect. In the development of WeChat public platform, configuring the interface address is the first step. This step must be completed before proceeding to the next step. After the interface address is configured, you can test it through the interface test in the platform provider platform of the WeChat public platform to check whether the interface is successfully connected.

2. Receive messages pushed by the WeChat public platform
After completing the interface address configuration, you can start receiving messages pushed by the WeChat public platform. To receive messages pushed by the WeChat public platform, you need to use the simplexml_load_string function under PHP to parse and convert them into corresponding objects for operation.

3. Process the received messages
Processing the received messages can be implemented according to the functions required by the public account. If you are implementing the image and text reply function, you need to judge the received message. If it is an event message, you need to judge the type of the event. If it is an event of concern, you need to reply with the corresponding image and text; if it is other events, you do not need to perform any operation.

4. Send the results back to the WeChat public platform
The last step is to convert the processing results into XML format and send them back to the WeChat public platform. In PHP, you can use the echo statement to output the result directly, or you can return the result in the function that sends the message and then output it.

5. Summary

This article briefly introduces how PHP implements the image and text reply function. Through this article, we can learn how to receive messages pushed by WeChat public platform, how to parse messages, how to process messages, how to convert the processing results into XML format and send them back to WeChat public platform and other knowledge points. These knowledge points are very important for PHP WeChat developers. If you are developing PHP WeChat, this article will be of great help to you.

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