Questions about common and static methods in PHP classes

<? PHP  /*  Product  */  Class  Product {  Public   Static   $ Count = 0 ;  Public   $ Name ='' ;  Public   Function  Show (){ Print ('<P> show method </P>' );}  Public   Static   Function  Display (){  Print ('<P> display static method </>' );}}  $ Class = New Reflectionclass ('product' );  Print "<PRE>" ; Reflection : Export ($ Class  );  Print "</PRE>" ; Product :: Display (); Product : Show (); //  Why can I access non-static methods in the following way? ?>

 
Class [class product] {@ D: \ webroot \ static. PHP 5-16-constants [0] {}-static properties [1] {property [public static $ count]}-static methods [1] {method [static public method display] {@ D: \ webroot \ static. PHP 13-15 }}- properties [1] {property [Public $ name]}-Methods [1] {method [public method show] {@ D: \ webroot \ static. php 9-11 }}}
 

Display static method

Show Method

 

The above isProgramIn the result of execution, the show method is a general method. Why can we use product: Show () for access without errors? Isn't the access from static methods the same? If so, what should I do with static methods? Which of the following gives me some advice. Thank you !!!