phpStuff.php

class MyClass{
  protected $_someMember;
  
  //Factory Method
  public static function MyClass::New(){
    return new MyClass();
  }
  
  public function Example(){
    $clojure = function(){
      //Inner stuff
    };
    
    
  }
  
  private function internalMethod($foo,$callback){
  
  }
  public function __construct(){

  }
};

$inst = MyClass::New();

$inst->internalMethod("LOL",function(){
  //internal callback
  return "FUN";
});