php - Using this operation -> inside and outside class -

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I know how this operation works (- & gt;), but I'm just curious. As you can see from the following code when you use it within a square, then it is $ this-> $ Name is , but outside of a class it's like $ a-> attribute . So why do you first use two dollar sign ($), but second, you only use a dollar sign? I'm very curious. I can ignore it, but it is happening on my nerves. 

  & lt ;? Php class classname {public $ attribute; Public Function __get ($ name) {return $ this-> $ Name; }} $ A = new classname (); $ A- & gt; Attribute = "hello"; Echo $ a- & gt; Specialty; ? & Gt;   
 Thank you in advance   
 
 
  $ this - & Gt; $ Name is the class of the object in  $ this ,  $ name  you have already passed the value to it, so you have declared that the  $ This- & gt; $ Name .  
  $ a-> Attribute  which is already declared, so you are accessing the object with the property.  
 If you use unused assets you can directly access  $ this-> Name .

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