How can PHP functions be organized and protected to ensure they are only accessible by authorized scripts?

To ensure that PHP functions are only accessible by authorized scripts, you can organize them within a class and use access modifiers such as private or protected to restrict access. By doing so, only methods within the same class or subclasses will be able to invoke these functions.

class MyClass {
    private function myFunction() {
        // Function code here
    }

    protected function anotherFunction() {
        // Function code here
    }
}