How to create yourself "tailed-function: like object array but function" as Laravel does in its eloquent?

Laravel eloquent has great job for managing queries. We can easily put simple statistics on it. For example, I have table called "Students" then I tried to count boys only as follow:

$total = Students::where(['sex'=>'boy'])->count();

I use service provider for creating my own function that I am able to call them using the format SomeClass::MyFunction(). My question is how to create function like-object array so that I can call them as follow:

$var = SomeClass::MyFunction()->newFunction();

Thank you for your help!

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