Really get the current post type on Wordpress Admin

wp_really_get_current_post_type.php

		/**
		 * gets the current post type in the WordPress Admin
		 */
		public function get_current_post_type()
		{
			global $post, $typenow, $current_screen;

			//we have a post so we can just get the post type from that
			if ($post && $post->post_type)
				return $post->post_type;

			//check the global $typenow - set in admin.php
			elseif ($typenow)
				return $typenow;

			//check the global $current_screen object - set in sceen.php
			elseif ($current_screen && $current_screen->post_type)
				return $current_screen->post_type;

			//check the post_type querystring
			elseif (isset($_REQUEST['post_type']))
				return sanitize_key($_REQUEST['post_type']);

			//check if we have the post id
			elseif (isset($_REQUEST['post']))
				return get_post_type($_REQUEST['post']);

			//last attempt try to handle data coming from wp_autosave
			$ajaxData = $_REQUEST['data']['wp_autosave'];

			//check the post_type querystring
			if (isset($ajaxData['post_type']))
				return sanitize_key($ajaxData['post_type']);

			//check if we have the post id
			elseif (isset($ajaxData['post']))
				return get_post_type($ajaxData['post']);

			return null;
		}