Filter the navigation markup. 

Parameters

.

( 2.1.0 ) . .

$nav_output

( string ) Opening container markup, nav, closing container markup. . . .

$nav

( string ) Navigation list (`

`). . . .

$args

( array ) { Arguments for `wp_nav_menu()`. . . .

$theme_location

( string ) Menu location ID. . . .

$container

( string ) Container markup. . . .

$menu_class

( string ) Class(es) applied to the `

`. . . .

$echo

( bool ) 0 to indicate `wp_nav_menu()` should return not echo. } . . .