What are potential security risks associated with using $_POST['ergebnis'] directly in PHP scripts?

Using $_POST['ergebnis'] directly in PHP scripts can expose your application to security risks such as SQL injection attacks or cross-site scripting (XSS) vulnerabilities. To mitigate these risks, it is important to properly sanitize and validate user input before using it in your code. One way to do this is by using functions like filter_var() or mysqli_real_escape_string() to sanitize user input before using it in database queries or outputting it to the browser.

// Sanitize and validate the input before using it
$ergebnis = isset($_POST['ergebnis']) ? filter_var($_POST['ergebnis'], FILTER_SANITIZE_STRING) : '';

// Use the sanitized input in your code
echo "User input: " . $ergebnis;