Extension example

<?php

class HomePage extends Page {

	private static $extensions = array(
		"GalleryExtension",
	);

}


class GalleryPage extends Page {

	private static $extensions = array(
		"GalleryExtension",
	);

}


class GalleryExtension extends DataExtension {

	private static $has_many = array(
		"GalleryImages" => "Image",
	);

	public function SomeMethod() {
		return $this->owner->ClassName;
	}

}

$homePage = new HomePage();
$galleryPage = new GalleryPage();

echo $homePage->SomeMethod(); // HomePage
echo $galleryPage->SomeMethod(); // GalleryPage