I've got this in my theme

<article <?php post_class('archiveMain'); ?>>

But for tags and categories it adds tag- or category- before the slug, any way to remove that?

Example: tag-sales would just be sales, category-webinar, just webinar

  • can I ask why you'd like this?
    – Tom J Nowell
    Jan 4, 2013 at 16:31
  • I'm going to be working with isotope to do some filtering, isotope.metafizzy.co/docs/filtering.html, I've built my links for filtering like this, <a href="#"data-filter=".'.$category->slug.'">'.$category->name.'</a>, I need to match $category->slug to the class but it appeared I was getting the slug with category or tag tacked on at the beginning.
    – Chuck
    Jan 4, 2013 at 18:54
  • would it not make more sense to jsut say data-filter=category-".$category->slug ?
    – Tom J Nowell
    Jan 4, 2013 at 20:10
  • that's exactly what I mentioned doing in the comments to toscho's answer
    – Chuck
    Jan 4, 2013 at 21:25

1 Answer 1


You can filter post_class and change these class names:

add_filter( 'post_class', 'wpse_78237_post_class' );

function wpse_78237_post_class( $classes )
    $out = array ();

    foreach ( $classes as $class )
        if ( 0 === strpos( $class, 'tag-' ) )
            $out[] = substr( $class, 4 );
        elseif ( 0 === strpos( $class, 'category-' ) )
            $out[] = substr( $class, 9 );
            $out[] = $class;

    return array_unique( $out );

But be aware this could result in collisions with other class names, in body_class for example. I would not do that.

  • Are you saying you wouldn't use something like this for body_class or that using this for post_class could cause issue with body_class?
    – Chuck
    Jan 4, 2013 at 18:57
  • 1
    @Chuck Both. Just imagine a category sticky or a tag archive. The prefixes don’t hurt.
    – fuxia
    Jan 4, 2013 at 19:00
  • I see now what you are getting at. I guess I'll just add category- or tag- to the slug I'm trying to match to the post_class, and that will work just as well. Thanks for the answer, and for steering me away from using it.
    – Chuck
    Jan 4, 2013 at 19:55

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