Use Self To Reference Static Class Properties

 
    <?php   class visitors
   {
      private static $visitors = 0;      function __construct()
      {
         self::$visitors++;
      }      static function getVisitors()
      {
         return self::$visitors;
      }   }   $visits = new visitors();
   echo visitors::getVisitors()."<br />";   $visits2 = new visitors();
   echo visitors::getVisitors()."<br />";?>

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