How to perform AJAX development in PHP7.0?

In Web development, AJAX technology (Asynchronous JavaScript and XML, Asynchronous JavaScript and XML) has become a very popular technology. It allows web pages to interact with the server data without refreshing, thereby improving user experience. In this article, we will introduce how to use PHP7.0 for AJAX development.

1. Introduction to AJAX

AJAX is a technology that uses JavaScript and XML for asynchronous data interaction. Its main advantage is the ability to update content without refreshing the page, thus improving user experience. In AJAX, an XMLHttpRequest object is created through JavaScript to interact with the server.

2. Using AJAX in PHP7.0

In PHP7.0, we can use the built-in HTTP extension for AJAX development. The HTTP extension provides a set of functions that can be used to send HTTP requests, handle HTTP responses, and create and handle cookies. The following is an example of AJAX:

<?php
// 设置响应头信息
header('Content-Type: application/json');

// 获取请求参数
$name = $_GET['name'];
$password = $_GET['password'];

// 验证用户名和密码
if ($name == 'admin' && $password == '123456') {
    $result = ['success' => true];
} else {
    $result = ['success' => false];
}

// 返回JSON格式的响应数据
echo json_encode($result);
?>

In the above code, the response header information is first set to tell the browser that the data returned is JSON format. Then the request parameters, namely username and password, were obtained. Then verify whether the username and password are correct, and finally return the result to the client in JSON format.

On the client side, we can use JavaScript to send AJAX requests and handle responses. The following is an example of jQuery:

$.ajax({
    url: 'check_login.php', // 发送AJAX请求的URL
    data: { // 请求参数
        name: $('#name').val(),
        password: $('#password').val()
    },
    type: 'GET', // 请求类型
    dataType: 'json', // 响应数据类型
    success: function(result) { // 成功回调函数
        if (result.success) {
            alert('登录成功');
        } else {
            alert('用户名或密码错误');
        }
    },
    error: function() { // 失败回调函数
        alert('服务器出错');
    }
});

In the above code, jQuery's $.ajax() function is used to send an AJAX request, and the request URL, request parameters, request type, response data type and Success and failure callback functions. When the server returns data in JSON format, use result.success to determine whether the login is successful.

3. Advantages and Disadvantages of AJAX

AJAX technology is widely used in modern web development, but it also has some advantages and disadvantages.

Advantages:

• Update content without refreshing the page, improving user experience;
• Can use asynchronous mode to interact with the server data, reducing the need for the server The pressure;
• can achieve more complex interface effects and interactive effects.

Disadvantages:

• cannot support the browser back function well;
• is not SEO friendly, and search engines may not be able to index the content generated by AJAX;
• Special attention needs to be paid to compatibility issues with lower version browsers.

4. Summary

In this article, we introduced how to perform AJAX development in PHP7.0. We used HTTP extensions to handle HTTP requests and responses, and jQuery to send AJAX requests and handle responses. Finally, we discussed the pros and cons of AJAX, as well as some issues to be aware of. AJAX technology is a very important technology in modern web development. It can improve user experience and achieve more complex interactive effects.

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