Creating a global object

PHP_Novice2

My site uses a file called library.php, which houses various classes and functions. One such class is called "DB," which handles all of my database functions. Rather than creating a new object in every class that uses the DB, I'd like to create a global object that all classes can call upon. I've tried the following:

class Singleton {

function getInstance($class)
{
	static $object = NULL;
	if ($object == NULL)
	{
		$object = new $class;
	}

	return $object;
}

}

$thisPage['singleton'] = new Singleton;

$db = $thisPage['singleton']->getInstance('DB');

While $db is accessible on a local level, my classes can't seem to access it. Is what I'm trying to accomplish possible with PHP, and how can it be done?

alsal

PHP Novice wrote:
My site uses a file called library.php, which houses various classes and functions. One such class is called "DB," which handles all of my database functions. Rather than creating a new object in every class that uses the DB, I'd like to create a global object that all classes can call upon. I've tried the following:
class Singleton {

function getInstance($class)
{
	static $object = NULL;
	if ($object == NULL)
	{
		$object = new $class;
	}

	return $object;
}

}

$thisPage['singleton'] = new Singleton;

$db = $thisPage['singleton']->getInstance('DB');
While $db is accessible on a local level, my classes can't seem to access it. Is what I'm trying to accomplish possible with PHP, and how can it be done?

$GLOBALS['db'] = $thisPage['singleton']->getInstance('DB');

That should work.