php - $this 的范围在 PHP 中是 funked 是错误还是功能？

Question

我有这个代码:

    class a(){
      function b(){
         if(isset($this){
            echo 'instance! ';
            echo get_class($this);
         }else{
            echo 'static';
         }
      }
    }


class C{
  public function test(){
      a::b();
  }
}

$CC=new C;
$CC->test();

这会回显

instance C

Answer 1

The pseudo-variable $this is available when a method is called from within an object context. $this is a reference to the calling object (usually the object to which the method belongs, but possibly another object, if the method is called statically from the context of a secondary object).

source

毫无疑问，这是一项功能，是设计使然，而不是错误。