What are the potential pitfalls of using a "/kiss XYZ" format in PHP and how can they be avoided?

Using a "/kiss XYZ" format in PHP can potentially lead to security vulnerabilities such as code injection if the input is not properly sanitized. To avoid this, always validate and sanitize user input before using it in a command execution function.

// Sanitize the input before using it in a command execution function
$input = filter_var($_GET['XYZ'], FILTER_SANITIZE_STRING);
exec("/kiss $input");