sminnee / silverstripe-framework

		}

		// Remove any illegal extensions that are present

		foreach($this->illegalExtensions as $class => $extensions) {

			foreach($extensions as $extension) {

				if ($class::has_extension($extension)) {

					if(!isset($this->extensionsToReapply[$class])) $this->extensionsToReapply[$class] = array();

					$this->extensionsToReapply[$class][] = $extension;

					$class::remove_extension($extension);

					$isAltered = true;

				}

			}

		}

		// Add any required extensions that aren't present

		foreach($this->requiredExtensions as $class => $extensions) {

		}

		// Add any required extensions that aren't present

		foreach($this->requiredExtensions as $class => $extensions) {

			$this->extensionsToRemove[$class] = array();

			foreach($extensions as $extension) {

				if(!$class::has_extension($extension)) {

					if(!isset($this->extensionsToRemove[$class])) $this->extensionsToReapply[$class] = array();

					$this->extensionsToRemove[$class][] = $extension;

					$class::add_extension($extension);

					$isAltered = true;

				}

			}

		}

		// If we have made changes to the extensions present, then migrate the database schema.

		if($isAltered || $this->extensionsToReapply || $this->extensionsToRemove || $this->extraDataObjects) {