WordPress at a glance
filter is not described

wp_page_menu_args filter-hook . WP 2.7.0

Filters the arguments used to generate a page-based menu.

Usage

add_filter( 'wp_page_menu_args', 'filter_function_name_3212' );
function filter_function_name_3212( $args ){
	// filter...

	return $args;
}
$args(array)
An array of page menu arguments.

Where the hook is called

wp_page_menu()
wp_page_menu_args
wp-includes/post-template.php 1342
$args = apply_filters( 'wp_page_menu_args', $args );

Where the hook is used (in WP core)

Does not used.