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1. scibuff
   Member
   Posted 1 year ago #

   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

2. Mark / t31os
   Moderator
   Posted 1 year ago #

   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.

3. scibuff
   Member
   Posted 1 year ago #

   thanks

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