User avatar and personalized dress settings for real-time chat system based on PHP

User avatar and personalized dress settings of PHP-based real-time chat system

With the popularity of social networks and online chat, the demand for user personalization has become more and more significant. . In a real-time chat system based on PHP, user avatars and personalized outfits are important factors to improve user experience and activity. This article will introduce how to implement the upload and display functions of user avatars through PHP, and provide code examples to help readers better understand.

1. User avatar upload

Before implementing the user avatar upload function, we need to create a folder for storing user avatars. Choose a suitable location on the server, such as the "avatars" folder in the root directory.

The following is a simple PHP code example for handling the function of user avatar upload:

<?php
    $allowedExtensions = ['jpg', 'jpeg', 'png']; // 允许上传的图片格式
    $maxFileSize = 2 * 1024 * 1024; // 允许上传的最大文件大小（2MB）
    
    if($_SERVER['REQUEST_METHOD'] == 'POST' && isset($_FILES['avatar'])) {
        $filename = $_FILES['avatar']['name'];
        $fileTmp = $_FILES['avatar']['tmp_name'];
        $fileSize = $_FILES['avatar']['size'];
        $fileError = $_FILES['avatar']['error'];
        
        $fileExtension = strtolower(pathinfo($filename, PATHINFO_EXTENSION)); // 获取文件扩展名
        
        if(in_array($fileExtension, $allowedExtensions) && $fileSize <= $maxFileSize) {
            $newFilename = uniqid() . '.' . $fileExtension; // 生成唯一的文件名
            $destination = 'avatars/' . $newFilename;
            
            if(move_uploaded_file($fileTmp, $destination)) {
                // 头像上传成功，将文件名保存到数据库中的用户信息表中
                $userId = $_SESSION['userId']; // 假设当前登录用户的ID为userId
                $query = "UPDATE users SET avatar = '$newFilename' WHERE id = $userId";
                // 执行数据库查询
            } else {
                echo "头像上传失败";
            }
        } else {
            echo "请上传符合要求的图片文件";
        }
    }
?>

In the above code, we first define the image formats allowed to be uploaded and the maximum allowed file size . Then, through form submission, the uploaded file information is obtained, including file name, temporary path, file size and error information. Next, we move the uploaded file to the specified directory by checking the legality of the file extension and file size. Finally, save the avatar file name to the user information table in the database for subsequent use.

2. User avatar display

After the user avatar is uploaded successfully, we need to display the avatar in the chat system. The following is a simple PHP code example to display the user's avatar:

<?php
    $userId = $_SESSION['userId']; // 假设当前登录用户的ID为userId
    $query = "SELECT avatar FROM users WHERE id = $userId";
    
    // 执行数据库查询 $result = ...
    
    if($result && mysqli_num_rows($result) > 0) {
        $row = mysqli_fetch_assoc($result);
        $avatar = $row['avatar'];
        
        // 头像展示
        echo "<img src='avatars/$avatar' alt='用户头像'>";
    } else {
        // 默认头像展示
        echo "<img src='avatars/default.jpg' alt='默认头像'>";
    }
?>

In the above code, we first obtain the user's avatar file name from the database. If the query result exists and has data, the avatar will be displayed on the page; if the query result is empty, the default avatar will be displayed.

3. User Personalized Dressing Settings

In the real-time chat system, users can set personalized dressing according to their own preferences, such as changing the color of chat bubbles, background images, etc. The following is a simple PHP code example for saving the user's personalized dress settings:

<?php
    $userId = $_SESSION['userId']; // 假设当前登录用户的ID为userId
    $backgroundColor = $_POST['backgroundColor'];
    $backgroundImage = $_POST['backgroundImage'];
    
    $query = "UPDATE users SET background_color = '$backgroundColor', background_image = '$backgroundImage' WHERE id = $userId";
    // 执行数据库查询
    
    // 重定向到设置页面或其他页面
?>

In the above code, we obtain the personalized dress settings from the form submitted by the user, including background color and background image . These settings are then saved to the user information table in the database.

Through the above code examples, we can implement the user avatar and personalized dress setting functions of the real-time chat system based on PHP. Providing users with free choices and personalized functions can improve user activity and user experience. Of course, the above code example is just a simple demonstration. In actual applications, security verification, file type restrictions, etc. may also be required. Readers can further develop and improve it according to specific needs.

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