I have a problem with static method usage (Classname::methodname())

here are two classes, for example:

<code>

class test1 {
  var $prop1;
  var $prop2;

  function test1($val1, $val2){
    $this->prop1 = $val1;
    $this->prop2 = $val2;
  }

  function test_method(){
   if($this){
     var_dump($this);
   }
   else {
     echo "do something"
   }
  }
 
}

class test2 {
  function test2(){
  }
  function run(){
    test1::test_method();
  }
}

t_obj = new test2();
t_obj->run();

</code>

I will always get output of var_dump, because in method of test1 test_method() $this is always set and it is reference or copy of initialized test2 class

Check of $this in test_method is required to check if it is static call or from this object, but it does not work, I think this is not correct behavior