WordPress at a glance
filter is not described

submenu_file filter-hook . WP 4.4.0

Filters the file of an admin menu sub-menu item.

Usage

add_filter( 'submenu_file', 'filter_function_name_9170', 10, 2 );
function filter_function_name_9170( $submenu_file, $parent_file ){
	// filter...

	return $submenu_file;
}
$submenu_file(string)
The submenu file.
$parent_file(string)
The submenu item's parent file.

Where the hook is called

In file: /wp-admin/menu-header.php
submenu_file
wp-admin/menu-header.php 48
$submenu_file = apply_filters( 'submenu_file', $submenu_file, $parent_file );

Where the hook is used (in WP core)

Does not used.