constant MENU_NOT_FOUND

Menu status code -- Not found.

This can be used as the return value from a page callback, although it is preferable to use a load function to accomplish this.

Menu status codes Status codes for menu callbacks. Menu system Define the navigation menus, and route page requests to code based on URLs.

22 uses of MENU_NOT_FOUND

admin_bar_flush_cache in core/modules/admin_bar/admin_bar.inc: Flush all caches or a specific one.
ajax_prepare_response in core/includes/ajax.inc: Converts the return value of a page callback into an Ajax commands array.
backdrop_deliver_html_page in core/includes/common.inc: Packages and sends the result of a page callback to the browser as HTML.
backdrop_json_deliver in core/includes/common.inc: Packages and sends the result of a page callback to the browser as JSON.
backdrop_not_found in core/includes/common.inc: Delivers a "page not found" error to the browser.

define('MENU_NOT_FOUND', 404)