How to receive array from axios in php background

In Web development, data interaction between the backend and the frontend is a very important topic. Due to the popularity of JavaScript, more and more front-end developers choose to use axios to send asynchronous requests to obtain background data. So how to receive the array from axios in the background?

First, let us understand what axios is. axios is an open source JavaScript library for sending asynchronous requests. It can be installed in a Node.js environment or used in the browser. Using axios, you can easily handle various types of HTTP requests, such as GET, POST, etc., and it also supports sending data, including JSON, form data, etc. In the front-end, we usually use axios to send requests and display the received data, but in the background, we need to receive and process the data sent by axios.

Next, we will introduce how to receive the array from axios in the php background.

Step 1: Use axios to send data

First, in the front end, we need to use axios to send an array to the background. The code is as follows:

axios.post('/backend.php', {
  data: [1, 2, 3, 4, 5]
})
.then(function (response) {
  console.log(response);
})
.catch(function (error) {
  console.log(error);
});

Through the above code, we send an array to the background at the address /backend.php, and the value of the array is [1, 2, 3, 4, 5]. The amount of data passed by this array is relatively small, but it can be used to demonstrate how to receive the array from axios in the background.

Step 2: Receive data in the php background

In the php background, we can use the $_POST array to receive the array data from axios. The code is as follows:

$data = $_POST['data'];
if (isset($data)) {
  // 对数据进行处理
}

Through the above code, we get the data with the key "data" from the $_POST array. If the data is obtained, we can process the data.

Step 3: Parse the array data

After receiving the array data from axios, we can use the json_decode function to parse the array data. The code is as follows:

$data = $_POST['data'];
if (isset($data)) {
  $dataArray = json_decode($data);
}

The above code assigns the parsed array data to the $dataArray variable.

Step 4: Traverse the array data

Next, we can traverse and operate the array data. For example, we can use the foreach statement to traverse the array. The code is as follows:

$data = $_POST['data'];
if (isset($data)) {
  $dataArray = json_decode($data);
  foreach ($dataArray as $value) {
    // 对数组元素进行操作
  }
}

Through the above code, we traverse the passed array elements and can perform various operations, such as accumulating and calculating the values ​​of the array. average and so on.

Step 5: Return the processed data to the front end

After processing the array data, we need to return the result to the front end. You can use the echo statement to return the processed data to the front end. The data is returned to the front end. For example, we can perform the json_encode operation on the processed array data. The code is as follows:

$data = $_POST['data'];
if (isset($data)) {
  $dataArray = json_decode($data);
  $result = array_sum($dataArray); // 对数组元素进行求和
  echo json_encode(array('result' => $result)); // 返回对数组求和的结果
}

Through the above code, we return the result of the array sum to the front end and wrap it in a json object. In the front end, we can get the results returned after background processing through response.data.result.

Summary

Receiving the array from axios in the PHP background is essentially to obtain the data through the $_POST array, use the json_decode function to parse the data, and then traverse and summarize the array elements. operate. Finally, we need to return the processed data to the front end. In actual development, we may need to perform more complex processing on the array, such as filtering and sorting the data in the array. Fortunately, PHP provides powerful array processing functions. We can use these functions to easily perform various operations on arrays to quickly complete complex data processing tasks.

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