In PHP development, how can the EVA principle (Eingabe - Verarbeitung - Ausgabe) be applied effectively to improve code structure and functionality?

To apply the EVA principle effectively in PHP development, you can separate the input, processing, and output stages of your code. This helps in improving code structure, readability, and maintainability. By clearly defining these stages, you can easily identify and troubleshoot issues, as well as make modifications or enhancements to your code more efficiently.

// Input stage
$input_data = $_POST['data'];

// Processing stage
$processed_data = process_data($input_data);

// Output stage
echo $processed_data;

function process_data($data) {
    // Processing logic here
    return $processed_data;
}