+// $pagenow is set in vars.php
+// $wp_importers is sometimes set in wp-admin/includes/import.php
+//
+// The remaining variables are imported as globals elsewhere,
+// declared as globals here
+global $pagenow, $wp_importers, $hook_suffix, $plugin_page, $typenow, $taxnow;
+
+$page_hook = null;
+