Create multiple functions that will all be executed in the same function php [closed]

I have been trying to figure out how to go about doing this but I am not quite sure how.

I want 2 sepreate function to only be executed in one function at the same time. Here is an example of what I am trying to do:

class test {
     public function executeTests(){

        $this->test1;
        $this->test2;       
     }
    private function test1(){
               //function doing something
          }
    private  function test2(){
               //function doing sommething else
          }