Example to explain how to implement a user sign-in function in PHP

With the development of the Internet, more and more websites will provide user check-in functions to increase user participation, retention rate, stickiness, etc. This article will introduce how to use PHP to implement user sign-in.

1. Preconditions

Before implementing user sign-in, we need to make the following preparations:

1. Database table

First , we need to create a corresponding user table in the database, which at least contains fields such as user ID, user name, password, registration time, and last check-in time.

2. Page layout

We need to add a sign-in button on the page, and after the user signs in, give a prompt message indicating that the sign-in is successful.

3. Implementation of sign-in function

We need to implement the business logic of sign-in based on PHP, including sign-in logic and storage of sign-in information.

2. Implementation steps

1. Connecting to the database

In PHP, we can use libraries such as mysqli or pdo to connect to the database. Next, we will connect to the MySQL database via mysqli and select the library to instantiate.

$mysqli = new mysqli('localhost', 'root', 'password', 'test');
if ($mysqli->connect_errno) {

die('Connect Error: ' . $mysqli->connect_errno);

}
$mysqli->set_charset('utf-8');

2. Processing query results

The database query result is a result set object, we need to It does the processing and gets the data we need from it.

$result = $mysqli->query('SELECT * FROM users WHERE user_id=1');
if (false === $result) {

die('查询失败');

}
$user = $result->fetch_assoc();
$result->free();

3. User sign-in business logic implementation

us The check-in function needs to be implemented through the following steps:

1) Query the last check-in time

$lastSignTime = strtotime($user['last_sign_time']);
$now = time();

// 如果上次签到时间与当前时间在同一天，则表示已经签到过，直接返回
if (date('Ymd', $lastSignTime) == date('Ymd', $now)) {
    return false;
}

2) Add points

// 更新用户信息
$sql = "UPDATE users SET score = score + $scoreToAdd, last_sign_time = '$now' WHERE user_id=$userId";
if (!$mysqli->query($sql)) {
    return false;
}

return true;

4. Add the link and logic of the check-in page

Add a "check-in" button to the page of your application. When the user clicks the button, the corresponding PHP script is called to implement the sign-in and points increase logic. In addition, you can also reward users with some points after successful sign-in.

3. Summary

This article introduces the basic implementation method of user sign-in based on PHP, including sign-in business logic and storage of sign-in information. You can make further improvements based on this. For example, you can increase the number of check-ins, check-in rankings and other functions to increase user participation rate. At the same time, we also need to consider how to avoid malicious behaviors such as check-in fraud and ensure the accuracy and security of data.

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