What are some common issues with user registration and character encoding in PHP forums?

Issue: Common issues with user registration and character encoding in PHP forums include allowing special characters in usernames, which can lead to security vulnerabilities and database errors. To solve this, it is recommended to sanitize user input and restrict usernames to alphanumeric characters only. 

// Sanitize user input for username
$username = preg_replace("/[^a-zA-Z0-9]/", "", $_POST['username']);

Keywords

User registration character encoding PHP forums encoding errors UTF-8.

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