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How can UTF-8 encoding be properly implemented in PHP to handle special characters in input fields?

Special characters in input fields can be properly handled in PHP by ensuring that the UTF-8 encoding is used consistently throughout the application. This can be achieved by setting the default charset to UTF-8 in the PHP configuration or by explicitly setting the encoding in the HTML form. Additionally, when processing input data in PHP, it's important to use functions like mb_convert_encoding() or utf8_encode() to ensure that the special characters are correctly handled.

php 
// Set default charset to UTF-8
header('Content-Type: text/html; charset=utf-8');

// Process input data with UTF-8 encoding
$input = $_POST['input_field'];
$input = mb_convert_encoding($input, 'UTF-8', 'auto');

// Use the sanitized input data
echo $input;

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