How can one ensure proper handling of special characters like umlauts in PHP when processing form data?

Special characters like umlauts can be properly handled in PHP by ensuring that the form data is correctly encoded and decoded using UTF-8. This can be done by setting the appropriate headers and using functions like mb_convert_encoding() to convert the data to UTF-8 before processing it. Additionally, using htmlspecialchars() when displaying the data can help prevent any potential security vulnerabilities. 

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

// Convert form data to UTF-8
$data = $_POST['data'];
$data = mb_convert_encoding($data, 'UTF-8', 'auto');

// Process the form data
// Your processing code here

// Display the form data safely
echo htmlspecialchars($data);

Keywords

PHP special characters umlauts form data encoding.

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