I'm running an add_filter function on the_content and I need to run the same function on the category description.

Does something like that exist or do I need to create a custom function for it?


Sure, hook it right onto category_description.

Here's an example:

function category_desc_filter( $desc, $cat_id ) {
    $desc = 'Description: ' . $desc;
    return $desc;
add_filter( 'category_description', 'category_desc_filter' );

Didn't test it but based on the Codex it should work.

See the Codex for more info: http://codex.wordpress.org/Plugin_API/Filter_Reference#Category_and_Term_Filters

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