(page_hook) action-hook . WP 1.5.0

Used to call the registered callback for a plugin screen.

This hook uses a dynamic hook name, $page_hook, which refers to a mixture of plugin page information including:

1. The page type. If the plugin page is registered as a submenu page, such as for Settings, the page type would be 'settings'. Otherwise the type is 'toplevel'.
2. A separator of '_page_'.
3. The plugin basename minus the file extension.

Together, the three parts form the $page_hook. Citing the example above, the hook name used would be 'settings_page_pluginbasename'.

Usage

add_action( '(page_hook)', 'action_function_name_3563' );
function action_function_name_3563(){
	// action...
}

Where the hook is called

do_action( $page_hook );

Where the hook is used (in WP core)