PHPCMS User Name Security Setting Strategy Revealed

In website development, user account security has always been an aspect that developers attach great importance to . The security settings of the username are also crucial, because the username is not only the user's login credentials, but may also expose the user's personal information and even cause security risks. This article will reveal the username security setting strategy in PHPCMS and give specific code examples for developers to refer to.

1. Prevent common usernames

In order to improve the security of usernames, developers should avoid users using usernames that are too simple and common, which are more likely to be guessed by malicious attackers. . Username complexity can be increased by prompting users on the registration page not to use common usernames, or by limiting the username format used when users register.

// 檢查用戶名是否包含常見用戶名
$commonUsernames = array('admin', 'root', 'user', 'test');
if (in_array($username, $commonUsernames)) {
    echo '用戶名過于常見，請(qǐng)重新輸入！';
}

2. Username length limit

In order to prevent the username from being maliciously exploited if it is too long, developers can limit the length of the username. It is generally recommended to be between 4-20 characters. When the length of the username entered by the user exceeds the limit, a friendly prompt should be given.

// 檢查用戶名長度是否符合要求
if (strlen($username) < 4 || strlen($username) > 20) {
    echo '用戶名長度應(yīng)在4-20個(gè)字符之間！';
}

3. Username character specifications

In addition to length restrictions, developers can also specify the character range of usernames, such as only letters, numbers, and underscores are allowed. This can prevent some special characters from posing a threat to the security of the user name.

// 檢查用戶名是否符合字符規(guī)范
if (!preg_match('/^[a-zA-Z0-9_]{4,20}$/', $username)) {
    echo '用戶名只能包含字母、數(shù)字和下劃線！';
}

4. Username uniqueness check

In order to ensure the uniqueness of the username, developers should query the database and check the entered username when the user registers or changes the username. Has it been registered? If the username already exists, the user should be prompted to choose a different username.

// 檢查用戶名是否已存在
$sql = "SELECT * FROM users WHERE username = '$username'";
$result = mysqli_query($conn, $sql);
if (mysqli_num_rows($result) > 0) {
    echo '用戶名已被注冊(cè)，請(qǐng)選擇其他用戶名！';
}

Conclusion

The above is the big reveal of the PHPCMS user name security setting strategy and specific code examples. By properly setting the security policy for user names, you can effectively improve the security of user accounts and reduce the risk of malicious attacks. I hope this article can inspire developers and apply it in actual development.

Reference materials:

1. [PHP Regular Expression Tutorial](https://www.runoob.com/php/php-pcre.html)
2. [PHP official documentation](https://www.php.net/)
3. [PHPCMS official documentation](http://phpcms.cn/)

Acknowledgement:
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