How to convert js array into usable data in php

In web development, it is often necessary to pass arrays in JavaScript to the back-end server for processing. In back-end development, PHP is a very commonly used programming language. So how do you convert an array in JavaScript into a data format usable in PHP? This article explains this process in detail.

1. Use AJAX technology to pass JavaScript arrays to the PHP backend

If you need to pass JavaScript arrays to the PHP backend for processing, you can use AJAX technology to achieve it. AJAX (Asynchronous JavaScript and XML) technology can interact with the server data without reloading the entire page, and can send requests to the server and receive responses asynchronously.

The specific implementation can be through the $.ajax method of the jQuery library. As shown below:

var js_array = [1, 2, 3, 4];
$.ajax({
    url: 'backend.php',
    type: 'POST',
    data: {my_array: js_array},
    success: function(response) {
        console.log(response);
    }
});

In the above code, we first define a JavaScript array and then pass it to the PHP backend with the help of jQuery’s $.ajax method. In the data parameter, we pass the JavaScript array as an object, where my_array is the property name of the object and js_array is the property value. In the PHP backend, we can get this array through $_POST['my_array'].

2. Convert JavaScript array to JSON format data

In the PHP backend, we can use the json_decode() function to convert JSON format data into PHP array. Therefore, before passing the JavaScript array to the PHP backend, it must be converted to JSON format data.

The specific implementation can convert JavaScript arrays into JSON format data through the JSON.stringify() method. As shown below:

var js_array = [1, 2, 3, 4];
var json_string = JSON.stringify(js_array);
$.ajax({
    url: 'backend.php',
    type: 'POST',
    data: {my_array: json_string},
    success: function(response) {
        console.log(response);
    }
});

In the above code, we use the JSON.stringify() method to convert the JavaScript array to JSON format data and pass it as a string in the data parameter. In the PHP backend we can convert it to an array in PHP via json_decode($_POST['my_array'], true).

It should be noted that the second parameter of the json_decode() function defaults to false, which means converting JSON data into an object in PHP. If you need to convert it to an array, you need to set the second parameter to true.

3. Use the $_REQUEST super global variable to obtain the JavaScript array

In addition to using the $_POST super global variable to obtain the passed data, PHP also provides some other super global variables Used to obtain data in HTTP requests. Among them, $_REQUEST is a PHP super global variable array containing $_GET, $_POST and $_COOKIE, which is used to obtain data submitted through GET or POST and data saved in Cookie.

So, in the PHP backend, we can also use $_REQUEST['my_array'] to get the JavaScript array. As shown below:

var js_array = [1, 2, 3, 4];
var json_string = JSON.stringify(js_array);
$.ajax({
    url: 'backend.php',
    type: 'POST',
    data: {my_array: json_string},
    success: function(response) {
        console.log(response);
    }
});

In the above code, we use AJAX technology to pass the JavaScript array in JSON format to the PHP backend, where my_array is the passed property name. In the PHP backend, we can directly use $_REQUEST['my_array'] to get this array and convert it to an array in PHP.

Summary

This article introduces in detail how to convert arrays in JavaScript into data formats available in PHP from the aspects of AJAX technology, JSON format data and PHP super global variables. I hope this article can help everyone learn web development.

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