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Using Static Methods and Properties to Limit Instances of a Class (PHP 5 Only)

<?php class Shop {   private static $instance;   public $name="shop";   private function ___construct() {   }   public static function getInstance() {     if ( empty( self::$instance ) ) {     self::$instance = new Shop();     }     return self::$instance;   } } $first = Shop::getInstance(); $first-> name="A"; $second = Shop::getInstance(); print $second -> name; ?>