How to use phpajson to implement login function

In today's Internet world, website user registration and login are basic needs for website development. There are also many ways to implement it. Among them, phpajson is a very practical technical method to implement login. This article will introduce how to use phpajson to implement the login function.

1. What is phpajson?

phpajson is a technology that combines PHP and JSON. It allows us to easily use PHP to process the JSON data passed by the front end, thereby realizing various functions of the website. What are the functions of PHP and JSON respectively?

PHP is a scripting language that can run on the server side. It is very suitable for database operations, file read and write operations, and data processing. JSON (JavaScript Object Notation) is a lightweight data exchange format. It is a data format similar to JavaScript objects and is usually used to store, exchange and transmit data.

phpajson combines PHP and JSON to give our website more powerful functions, such as implementing editable data tables, querying products on web pages, achieving refresh-free saving, etc.

2. The basic process of phpajson to realize login

If we want to use phpajson technology to realize the website user login function, we need to master the following basic process first:

1. Write the front end Login page, fill in the username and password in the page, and use jQuery's $.ajax() method and the phpajson plug-in to pass the username and password to the back-end php script for verification.

2. The back-end php script receives the login information passed from the front-end and performs a series of verification operations, such as verifying whether the user name and password are correct.

3. After the back-end php script is verified, the data in JSON format is returned to the front-end, indicating that the login is successful, and the user's login status (such as user ID and other information) is stored in the Session.

4. After the front-end page receives the message of successful login, it uses JavaScript code to jump to the user's homepage after login, and at the same time, reads the user ID and other information from the Session to facilitate subsequent business. Logical operations.

3. Code implementation of phpajson login

1. Writing the front-end login page

In the user login page, we usually need to perform the following operations:

1. Write HTML code to complete the login form.

For example:

用户名：<input type="text" name="username" id="username"/><br/>
密码：<input type="password" name="password" id="password"/><br/>
<input type="submit" value="登录"/>

2. Use jQuery's ajax() method to pass the login information to the back-end php script.

For example:

$("#login_form").submit(function(){

$.ajax({
    type: "post",
    url: "login.php",
    data: $('#login_form').serialize(),
    dataType: "json",
    success: function(data){
        if(data.status == 200){ //登录成功 
            alert(data.message);
            window.location.href = "user_home.php";
        }else{ //登录失败
            alert(data.message);
        }
    },
    error:function(XMLHttpRequest, textStatus, errorThrown){
        alert(XMLHttpRequest.status);
        alert(XMLHttpRequest.readyState);
        alert(textStatus);
    }
});

});

In the ajax() method , we first specified the request type as "post", then specified the URL address of the back-end php script, and serialized the parameters of the login form using the $('#login_form').serialize() method for convenience Passed to the backend php script for processing.

In the success callback function of the ajax() method, we determine whether the login is successful based on the status field of the JSON data returned by the backend. If successful, the user will be prompted to log in successfully and use JavaScript code to jump to the page. Go to the user homepage, otherwise the user will be prompted to log in failed.

2. Writing of back-end php script

In the back-end php script, we need to process the login request passed by the front end and perform a series of verification operations, such as:

session_start(); //Start Session

$username = $_POST['username'];
$password = $_POST['password'];

//Perform user verification operations to determine whether the user name and password are correct, etc.
if($username == "admin" && $password == "123456"){

$_SESSION['user_id'] = 1; //设置用户ID
$result = array('status' => 200,'message' => '登录成功'); //登录成功
echo json_encode($result);</p>
<p>}else {</p>
<pre class="brush:php;toolbar:false">$result = array('status' => 400,'message' => '用户名或密码错误'); //登录失败
echo json_encode($result);

}
?>

After the verification is passed, we can store the id information or other user information in the Session to facilitate subsequent business logic operations.

4. Precautions for phpajson to implement login

1. Phpajson requires front-end and back-end cooperation to implement login. The front-end is mainly responsible for the style and function of the page, and the back-end is mainly responsible for the processing and verification of user data. .

2. When using phpajson for development, make full use of the advantages of jQuery and phpajson plug-ins to write efficient, concise, and easy-to-extend code.

3. In order to enhance the security of the website, we usually need to verify, filter and encrypt the data submitted by the front end at the back end to avoid various cross-site attacks and data leakage.

In short, phpajson's implementation of the login function is a flexible, efficient, and easily scalable technical solution that allows us to complete development work more easily and quickly when implementing the website user login function.

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