This question already has an answer here:
Is there any equivalent keyword in C# to reference the class from within itself on static method calls, without using the proper class name?
The PHP equivalent would be self.
</div>
If it happens inside the class, you don't need to use reference. Just using the method/property name will work, since it is in the current scope. If it is in another class, then it's not SELF, so you need to use the classname.