What are some potential pitfalls to be aware of when working with special characters like umlauts in PHP, especially in the context of forums or web applications?

Special characters like umlauts can cause encoding issues in PHP, especially when dealing with user input in forums or web applications. To avoid problems, it's important to consistently use UTF-8 encoding throughout your application and sanitize user input to prevent potential security vulnerabilities like SQL injection attacks. 

// Set UTF-8 encoding for PHP
header('Content-Type: text/html; charset=utf-8');
mb_internal_encoding('UTF-8');

// Sanitize user input
$input = $_POST['input'];
$sanitized_input = htmlspecialchars($input, ENT_QUOTES, 'UTF-8');

Keywords

UTF-8 htmlentities mbstring htmlspecialchars encoding

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