php new self() 和 new static 之间

 

 

class A {
  public static function get_self() {
    return new self();
  }
 
  public static function get_static() {
    return new static();
  }
}
 
class B extends A {}
 
echo get_class(B::get_self()); // A
echo get_class(B::get_static()); // B
echo get_class(A::get_static()); // A

 

 

class A {
  public function create1() {
    $class = get_class($this);
　　　　return new $class();
  }
  public function create2() {
    return new static();
  }
}
 
class B extends A {
 
}
 
$b = new B();
var_dump(get_class($b->create1()), get_class($b->create2()));
 
/*
The result 
string(1) "B"
string(1) "B"
*/