How to develop a scalable mutual follow function using PHP?

How to use PHP to develop an scalable mutual follow function?

In social network applications, the mutual follow function is a very important and common function. It allows users to follow each other, and users who follow each other can get each other's dynamic updates and interactions. Whether it is a Weibo platform, a social forum, or other forms of social networks, the mutual follow function is the basis for establishing connections and interactions between users.

In this article, we will develop an extensible mutual follow function using PHP. We will use a MySQL database to store data for users and follow relationships, and use PHP to handle associations and queries between users.

First, we need to create a database to store user and follow relationship data. We can create two tables, one to store user information and the other to store the attention relationships between users. The structure of the user table can include fields such as user ID, user name, and password. The structure of the following relationship table may include two fields: follower ID and followed person ID.

Next, we need to create a PHP file to handle the user's follow and unfollow operations. First, we can create a function to handle following actions between users. This function will receive the follower ID and the followed person ID as parameters, and save the following relationship to the following relationship table. For example:

function followUser($followerID, $followingID) {
    // 在关注关系表中插入一条记录
    $query = "INSERT INTO follows (follower_id, following_id) VALUES ($followerID, $followingID)";
    // 执行数据库操作
    // ...
}

In terms of unfollowing, we can create a function to delete the following relationship from the following relationship table. This function will receive the follower ID and the followed person ID as parameters, and delete the corresponding records in the following relationship table. For example:

function unfollowUser($followerID, $followingID) {
    // 从关注关系表中删除记录
    $query = "DELETE FROM follows WHERE follower_id = $followerID AND following_id = $followingID";
    // 执行数据库操作
    // ...
}

In addition to following and unfollowing operations, we can also create some other functions to extend the mutual following function. For example, we could create a function to get a user's follower list. This function will receive the user ID as a parameter and query the following relationship table to obtain the list of follower IDs. For example:

function getFollowers($userID) {
    // 查询关注关系表以获取关注者的ID列表
    $query = "SELECT follower_id FROM follows WHERE following_id = $userID";
    // 执行数据库操作，获取关注者的ID列表
    // ...
}

Similarly, we can also create a function to get the user's watch list. This function will receive the user ID as a parameter and query the following relationship table to obtain the list of IDs followed by the user. For example:

function getFollowing($userID) {
    // 查询关注关系表以获取用户关注的ID列表
    $query = "SELECT following_id FROM follows WHERE follower_id = $userID";
    // 执行数据库操作，获取用户关注的ID列表
    // ...
}

Through the above functions, we can easily implement a basic mutual attention function. However, in actual development, we may need to consider more complex requirements, such as following user dynamic updates, interactive reminders and other functions. For these needs, we can use other technologies and methods to achieve it.

To sum up, this article introduces how to use PHP to develop an scalable mutual attention function. Through reasonable database design and PHP function development, we can easily implement follow and unfollow operations between users, and we can expand functions according to our own needs.

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