php - OOP issue: Call to a member function prepare() on a non-object -


I am trying to use the PDO and so I am putting it into a waiter in my database class: 

  class database {// DSN, username and password private $ mysql; Public function __ composition () {$ mysql = new PDO ($ this- & gt; DSN, $ this-> dbUsername, $ this- & gt; dbPassword); $ mysql- & gt; Set Attribution (PDO :: ATTR_UMLamp PREPARES, Incorrect); $ mysql- & gt; Set attribute (PDO :: ATTR_ERRMODE, PDO :: ERRMODE_EXCEPTION); $ This- & gt; mysql = $ mysql; } Public Function Database () {Return $ this- & gt; Mysql; }}   
 and I'm calling the database method such as:  
  class router database {public function login () {$ query = $ this extends ) - & gt; mysql () - & gt; Prepare ('SELECT * ...'); $ Query-> But execute (array (...)); ...}   
 Although I keep the following error:  
  Fatal error: Call a member function (on non-object) / Code>  
 I have asked more knowledgeable people about myself, although I am still confused about why this will not work.  
 Thank you!   
 
 
 You  Personal  Access Modifier  Private $ mysql;  are using. It is  protected $ mysql; Change to .

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