What are potential issues when allowing unregistered users to access a PHP forum?

Potential issues when allowing unregistered users to access a PHP forum include spamming, trolling, and security vulnerabilities. To solve this, you can implement a user registration system where users need to create an account before accessing the forum. This way, you can track user activities, prevent spamming, and ensure a more secure environment for discussions. 

// Example PHP code for user registration system
<?php
// Check if user is logged in
session_start();
if(isset($_SESSION['user_id'])){
    // User is logged in, allow access to forum
} else {
    // User is not logged in, redirect to registration page
    header("Location: registration.php");
    exit();
}
?>

Keywords

SQL injection Cross-site scripting Session hijacking User authentication Data validation

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