Prevent specific categories from being used in URL/permalink WordPress

John Cotton answers:

Hey Tracy

I think what you're after happens in the get_sample_permalink function.

In which case, you could catch the new permalink with a filter and do your checks/changes.

add_filter('post_link', 'filter_permalink_categories', 10, 3);
function filter_permalink_categories($permalink, $post, $leavename) {
if($post->filter == 'sample') {
// At this point, the permalink looks like this:
// http://mywebsite.com/current-category-slug/%postname%

// So let's change!
$permalink = str_replace('current-category-slug', 'my-other-category-slug', $permalink);
}
return $permalink;
}


Obviously, your code would need to be more sophisticated at the str_replace line - testing for those you don't want and replacing with whatever you do, but hopefully you get the idea.

Vidyut Kale answers:

uh, about my code above, you should use one variable for the unwanted cats and use it in the "in_category" as well. I didn't, above.... and I don't seem to have an option to edit it better.
Something like:

function choosy_cat_permalink() {
$old=get_permalink(); //mistake in earlier code
$old_cats=get_the_catefories();
//you can edit this array or rig up something in theme options
$dont_want_cats = array('all', 'unwanted', 'cat', slugs');
if ( in_category( $dont_want_cats )) {
$nowcat = $new_cats[0]->slug;
if ( $parent = $new_cats[0]->parent )
$nowcat = get_category_parents($parent, false, '/', true) . $category;
$final = str_replace($dont_want_cats, $nowcat, $old);
return $final;
}

In your template, you can call it like:

<a href="<?php choosy_cat_permalink(); ?>"> Your post title or <?php the_title(); ?></a>


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