class - php without __get function, you can't get a value from certain instances? -

Since my tech book told me, so I am thinking that this is true, for example:

  square A {public $ attr = "hmm"; } $ A = new A (); Echo $ a-> ether; // output Hmm   
 works well for me, the book is not that it is not making a __get function in order to use it outside the classroom, I'm a little confused   
 
 
 both  public  variables and magical  __get (< / Code> Methods are considered to be a  poor behavior  First of all, objects have to be piled up to pile up objects, whereas magic Getters / Setters attract complexity.  
 Some operations on the data in Setter are common, before the parameters, for example, you will validate the email address. Or format of phone number Instead, when you use the magical  __ go  and  __set  methods, then you have to do all this in one method.  
 In fact, your magical setter turns a large cluster of different depth * uck's  if .. and  statement.  
 Instead you should create a custom paragraph for the example parameters that you want to manipulate:  
  class book {Private $ title; Private $ author; Public function __ composition ($ author = null, $ author = null) {$ this- & gt; Title = $ heading; $ The-> author = $ author; } Public Function Settle ($ title) {$ this- & gt; Title = $ title; } Public Function Set Writer ($ author) {$ this- & gt; Author = $ author; }}   
 used as:  
  $ example = new book ('gym butcher'); $ Isntance- gt; SetTitle ('Fool's Moon');