PHP upcasting object [duplicate]

问题

This question already has answers here:

Cast the current object ($this) to a descendent class (5 answers)

Closed 5 years ago.

can I upcast an object to it's parent object?

Example Code

class ClassA {
  public function foo(){
    echo get_class($this);
  }
}

class ClassB extends ClassA {
  public function foo(){
    echo get_class($this); // prints ClassB :)
    parent::foo();         // prints ClassB / I want ClassA :(
  }
}

$B = new ClassB();
$B->foo();

is it possible in PHP;

In my scenario I'm building ClassB and I want to overide function ClassB::Foo() to extend its behavior and then handle the control back to it's parent function ClassA::Foo() but the code breaks because it is now an object of ClassB. Plz don't blame me about "code smells" because I now that its ugly! ClassA is out of my control... :-)

回答1:

Try using the __CLASS__ Magic Constant. It returns the class name that you are currently in, regardless of any inheritance going on.

来源：https://stackoverflow.com/questions/24105260/php-upcasting-object