php - Creating object from parent class and call class from child class -

i have 1 class created huge , has many methodes. want slice separate child classes.

i attempt this:

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class parentclass{  }  class childclass1 extends parentclass{        public function childfunction1(){        }  }  class childclass2 extends parentclass{        public function childfunction2(){        }  }  $myobject = new parentclass(); $myobject->childfunction1(); $myobject->childfunction2(); 

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not working.
it's possible?
there alternative solution?

no, not work way. you're doing instantiating empty class , trying call methods on it.

you should use composition instead. basic idea compose multiple objects main object. break off objects functionality. remember follow single responsibility principle , rest of solid.