PHP calls WeChat official account interface to send messages

PHP calls the WeChat public account interface to send messages

With the popularity of social media, WeChat has become a social tool that people often use in life and work. For enterprises, using WeChat public accounts to interact with users has become a necessary marketing tool. As a programming language widely used in web development, PHP also has the ability to call the WeChat official account interface. This article will introduce in detail how PHP calls the WeChat official account interface to send messages.

1. Register a WeChat public account and obtain a developer account

Before using the WeChat public account to develop interfaces, we need to register a WeChat public account on the official website. After registration, we also need to create a developer account and perform identity authentication in order to obtain the AppID and AppSecret required by the developer. This information can be found in the Developer Center of the WeChat public platform. We need to save these keys in the program code so that they can be used when calling the interface.

2. Obtain access_token

Before calling the WeChat official account interface in PHP, we need to obtain an access_token first, which is a necessary parameter for calling the interface. The access_token can be obtained by sending an HTTP request to the WeChat server. Each request is valid for only 7200 seconds. We can use file_get_contents or curl in the code to send a GET request to the WeChat server to obtain the access_token. It should be noted that we need to cache the obtained access_token to avoid frequently sending requests to the WeChat server and wasting bandwidth resources.

3. Build the message format

After successfully obtaining the access_token, we can start to build the message format. There are many message formats in the WeChat official account interface, including text messages, picture messages, voice messages, video messages, etc. In this article, we take text messages as an example to introduce how to build message formats. The message format can be defined in the form of an array in the code, such as the following example:

$msg=array(

'touser'=>$openid,  
'msgtype'=>'text',  
'text'=>array('content'=>$content)  

);

where openid represents the user's unique Identifier, content represents the text content to be sent. When defining the message format, we need to set different parameters according to different message types. For example, when sending a picture message, we need to set msgtype to image and set media_id to the ID of the picture material.

4. Send a message

After the message format is constructed, we can send a POST request to the WeChat server and call the interface to send the message to the user. In code, we can use the curl library or other similar tools to send POST requests. The URL address for sending the request is:

https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=ACCESS_TOKEN

Among them, ACCESS_TOKEN is passed above The steps to obtain the access_token. We need to send the message format to the WeChat server in JSON format, and then wait for the response from the WeChat server.

5. Error handling

When using PHP to call the WeChat official account interface to send messages, we need to pay attention to error handling. If sending a request to the WeChat server fails or does not receive a response, we need to handle these exceptions in the program code and give corresponding prompt information. If an error occurs during the sending process, the WeChat server will return data in JSON format containing an error code and error information. We need to judge whether the sending is successful based on these error codes.

The above is the basic process of PHP calling the WeChat official account interface to send messages. By understanding these knowledge points, we can use PHP to call the WeChat official account interface more flexibly, and use the WeChat official account as a powerful marketing tool to guide users to purchase, follow and other activities.

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