How to pass array to WeChat applet in php

When developing WeChat applets, it is often necessary to use php as a background service. One of the common questions is how to pass arrays to applet. This article will introduce how to pass arrays to WeChat applet in php.

1. Request method in WeChat applet

The request method used in WeChat applet is the POST method in HTTP protocol. We can use $_POST in php to obtain the data sent by the applet.

For example, we can use the wx.request() method in the applet to initiate a POST request to php. The code is as follows:

wx.request({
  url: 'http://www.example.com/api/get_data.php',
  method: 'POST',
  data: {
    key1: value1,
    key2: value2
  },
  success: function(res) {
    console.log(res.data);
  }
})

In the above code, we can pass the data that needs to be sent. data to the server.

2. Processing the received array in PHP

After receiving the data sent by the applet, we can process the array data in PHP. We can use $_POST to get array data. For example, we can obtain the data sent by the applet through the following code:

$data = json_decode(file_get_contents("php://input"), true);

In the above code, we use the json_decode function to decode the received JSON data into a php array.

3. Pass the php array to the applet

After processing the received array in php, we can pass the array data to the applet. We can use the json_encode function to convert the array into a JSON string. For example, we can convert the data into a JSON string through the following code:

$data = array(
  'key1' => 'value1',
  'key2' => 'value2'
);

echo json_encode($data, JSON_UNESCAPED_UNICODE);

In the above code, we use the json_encode function to convert the php array into a JSON string. In the array we can add any number of key-value pairs and pass them to the applet.

4. Processing the received data in the applet

When the applet receives the JSON data from php, we can use the JSON.parse() method to parse the JSON string into javascript object. For example, we can use the following code in the success callback function to obtain the data returned by the server and parse it:

wx.request({
  url: 'http://www.example.com/api/get_data.php',
  method: 'POST',
  data: {
    key1: value1,
    key2: value2
  },
  success: function(res) {
    var data = JSON.parse(res.data);
    console.log(data.key1);
    console.log(data.key2);
  }
})

In the above code, we use the JSON.parse() method to parse the JSON data returned by the server into javascript object. We can get the data directly through the key name.

Summary

This article introduces how to pass arrays to WeChat applet in php. We use PHP's json_encode function to convert the php array into a JSON string, and use the applet's JSON.parse() method to parse the JSON string into an object for more convenient use in the applet. I hope this article can help you strengthen your WeChat applet and PHP programming skills.

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