WP_Screen::set_current_screen()

	public function set_current_screen() {
		global $current_screen, $taxnow, $typenow;
		$current_screen = $this;
		$taxnow = $this->taxonomy;
		$typenow = $this->post_type;

		/**
		 * Fires after the current screen has been set.
		 *
		 * @since WP-3.0.0
		 *
		 * @param WP_Screen $current_screen Current WP_Screen object.
		 */
		do_action( 'current_screen', $current_screen );
	}