A brief analysis of how to achieve bridging (communication) between php and js

With the continuous development of Internet technology, the importance of front-end development for websites has become increasingly prominent. In front-end development, JavaScript is an essential part, but its expressiveness is limited in some aspects. PHP is a powerful language that can handle rich data. It can manipulate large amounts of data and present it to the front end. However, communication between PHP and JavaScript is not that easy since they are two different languages. In order to solve this communication problem, we can use a technology called "bridging" to allow smooth communication between PHP and JavaScript.

What is bridging technology?

Bridging technology refers to connecting one object or class with other objects or classes so that they can communicate and cooperate with each other. In the bridging technology between php and js, it is generally implemented through HTTP requests. When the web page sends a request, the PHP script will obtain the request and hand the data to JavaScript for processing, and JavaScript will return the processing results to the PHP script. This bridging technology can increase the scalability and maintainability of the program while also providing users with a better user experience.

Implementing the bridge between PHP and JavaScript

Before realizing the bridge between PHP and JavaScript, it needs to be clear that the communication between the two languages ​​is achieved through HTTP requests. The following are some commonly used technologies for handling HTTP requests and responses:

• Ajax technology. Through Ajax technology, we can directly initiate asynchronous requests to the server on the Web page, obtain data and display it on the page. Ajax is an encapsulation of the XMLHttpRequest object and can handle asynchronous requests and handle asynchronous operations such as server response data.
• jQuery technology. jQuery is a JavaScript library that can simplify the traversal, operation, event listening and other operations of HTML documents, and also provides many convenient tool functions. jQuery is widely used in front-end development.

Next, let’s take a look at how to implement the bridge between PHP and JavaScript.

1. Return JSON data in PHP script

In PHP, we can use the json_encode() function to convert the data into JSON format, and then return the data to JavaScript:

$student = array(
    "name" => "Tom",
    "age" => "25",
    "address" => "Beijing"
);

echo json_encode($student);

2. Use Ajax to request data in JavaScript

Here we use jQuery's Ajax method to obtain the json data returned by the server through a get request. What needs to be noted here is that the dataType parameter needs to be used to declare that the data type returned by the server is JSON.

$.ajax({
    type: "get",
    dataType: "json",
    url: "getData.php",
    success: function(data){
        console.log(data);
        console.log(data.name);
        console.log(data.age);
        console.log(data.address);
    }
});

3. Return data from JavaScript to PHP

In JavaScript, we can use XMLHttpRequest Object passes data to the PHP server. Here we use the POST method to send form data to the server:

$.ajax({
    type: "POST",
    dataType: "json",
    url: "demo_post2.php",
    data: {
        "name":"test_name",
        "age":"18",
        "address":"China"
    },
    success: function(data){
        console.log(data.message);
    }
});

In PHP, we use $_POST to receive data from JavaScript:

$name = $_POST['name'];
$age = $_POST['age'];
$address = $_POST['address']; 

$message = "name:".$name."age:".$age."address:".$address;

// 把信息转成json
$result = array("message" => $message);

echo json_encode($result);

Summary

Usage Bridging technology can easily realize communication between PHP and JavaScript, so that PHP can pass data to JavaScript, and JavaScript can also pass data back to PHP. This technology opens up more room for development of our web programs and also improves the user experience. Of course, although bridging technology can play a role as a bridge, in actual development, it is recommended to keep business logic in their respective fields to increase the maintainability and scalability of the program.

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