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I'm trying to remove all menu-item classes (except for .current-menu-{item/parent/ancestor} and .menu-item-has-children)

function custom_nav_menu_css_class($classes) {
    $classes = preg_replace('/^((menu|page)[-_\w+]+)+/', '', $classes);
    return $classes;
add_filter('nav_menu_css_class', 'custom_nav_menu_css_class');

This almost does the job, except it removes .menu-item-has-children? Any idea what I should change, to exclude it from being removed?

(P.S. I'd rather not use a custom walker...)

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up vote 1 down vote accepted

You could work with a white-list and replace the regular expression with something more readable:

add_filter( 'nav_menu_css_class', function( $classes ) {
    $allowed = array(
    $output      = array();

    foreach ( $classes as $class )
        if ( in_array( $class, $allowed ) )
            $output[] = $class;

    return $output;

That would make it easier to maintain the white-list too.

share|improve this answer
Good idea! But I'm getting 'explode() expects parameter 2 to be string' – Lisa Feb 8 '14 at 20:59
@Lisa My bad. Hastily written code without even testing it. :) I made an update to my answer. – toscho Feb 8 '14 at 21:01
Thanks this works! Though I changed it to return $output because it kept saying join() passed invalid arguments. Will changing this cause a problem tho? – Lisa Feb 8 '14 at 21:25
@Lisa That was a leftover from my last edit. return $output; is correct, I fixed that in my answer. – toscho Feb 8 '14 at 21:31

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