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[Resolved] nav_menu_css_class Missing argument 2

  • I’m trying to add some classes to my menu items… I see that the Walker_Nav_Menu calls apply_filters with the ‘nav_menu_css_class’ tag and two arguments ( $classes and $item )
    $class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item ) );

    Nevertheless, filter function receives only one argument, i.e. only the $classes array

    function my_nav_menu_css_class( $classes = array(), $item ) {
    	echo "\n<!-- func_get_args: \n"; print_r( func_get_args() ); echo "\n-->\n";
    	return $classes;
    add_filter( 'nav_menu_css_class', 'my_nav_menu_css_class' );

    keeping the second argument in my function results in “missing argument 2” warning and the value of $item is NULL

    … thus to achieve a simple task of adding classes I have to use a Walker class (which works fine) but it should NOT need to be necessary

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  • By default filters/actions support only one parameter/arg, you need to specify the supported args inside the add_filter call with the fourth parameter..

    add_filter( 'nav_menu_css_class', 'my_nav_menu_css_class', 10, 2 );

    10 – priority
    2 – supported args

    This is covered on the docs for add_filter.


Viewing 2 replies - 1 through 2 (of 2 total)
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