class MyClass { final public function myMethod() { } } $class = new ReflectionClass('MyClass'); if ($class->isFinal()) { echo 'The class is final and cannot be extended'; }In this example, we define a class called MyClass with a final public method called myMethod. We then create a ReflectionClass object for the MyClass class and use the isFinal method to check if the class is final. Since it is indeed final, the code prints 'The class is final and cannot be extended'. Based on the use of the ReflectionClass method, it is likely that the package library being used is the PHP Reflection package, which provides a set of functions for examining the structure of classes, interfaces, and functions in PHP.