Simple (?) Singleton Question
Posted: Mon Nov 12, 2007 8:07 pm
Not being a seasoned PHP developer, tonight I started playing with the use of the Singleton pattern to store configuration information. What I was surprised to find was that the instance - at least the one I'm creating - isn't really a singleton. With each request, the constructor is called. Isn't that very much *not* a singleton or am I misunderstanding or doing something wrong? I'm using a pretty simple case:
I've called this code on a dummy page and each time I refresh the page, the word "Constructing" is printed. What am I not doing or not understanding?
Any insight would be greatly appreciated.
Thanks.
Rob
Code: Select all
class Config
{
private static $instance;
private function __construct() {
echo '<p>Constructing</p>';
}
public static function getInstance()
{
if ( is_null ( self::$instance ) )
{
self::$instance = new self();
}
return self::$instance;
}
public function clear() {
echo '<p>clearing...</p>';
self::$instance = null;
}
}Any insight would be greatly appreciated.
Thanks.
Rob