How can using switch statements in PHP help create a whitelist for safe input handling?

Using switch statements in PHP can help create a whitelist for safe input handling by allowing you to specify acceptable values and reject anything that does not match those values. By checking input against a predefined list of acceptable options, you can prevent potentially harmful input from being processed or executed. This can help protect your application from attacks such as SQL injection or cross-site scripting.

$input = "safe_input";

switch($input) {
    case "safe_input":
        // Process safe input
        break;
    default:
        // Reject input
        break;
}