What are some common pitfalls to avoid when implementing user-generated content features in PHP?

One common pitfall to avoid when implementing user-generated content features in PHP is failing to properly sanitize user input. This can leave your application vulnerable to SQL injection attacks or cross-site scripting (XSS) attacks. To mitigate this risk, always sanitize and validate user input before using it in your application. 

// Sanitize user input using the filter_var function
$user_input = filter_var($_POST['user_input'], FILTER_SANITIZE_STRING);

// Validate user input to ensure it meets certain criteria
if (strlen($user_input) < 5) {
    // Handle validation error
} else {
    // Proceed with using the sanitized user input
}

Keywords

SQL injection Cross-site scripting (XSS) Input validation Content moderation File upload vulnerabilities

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