How does the EVA (Eingabe Verarbeitung Ausgabe) principle apply to handling form data in PHP?

When handling form data in PHP, it is important to follow the EVA (Eingabe Verarbeitung Ausgabe) principle. This means separating the input, processing, and output stages of the data. By doing so, you can ensure that the data is sanitized, validated, and securely displayed to the user. 

// Input stage - Retrieve form data
$name = isset($_POST['name']) ? $_POST['name'] : '';
$email = isset($_POST['email']) ? $_POST['email'] : '';

// Processing stage - Sanitize and validate data
$name = filter_var($name, FILTER_SANITIZE_STRING);
$email = filter_var($email, FILTER_VALIDATE_EMAIL);

// Output stage - Display sanitized data
echo "Name: " . $name . "<br>";
echo "Email: " . $email;

Keywords

PHP EVA principle form data handling input validation

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