How to exclude/filter a tag from get_the_tag_list()

Question

Does anyone know how to exclude/filter a tag from the HTML string generated by get_the_tag_list()?

http://codex.wordpress.org/Function_Reference/get_the_tag_list

Any help much appreciated.

Answer 1

function mytheme_filter_tags( $term_links ) {
    $result = array();
    $exclude_tags = array( 'some tag', 'another tag', 'third tag' );
    foreach ( $term_links as $link ) {
        foreach ( $exclude_tags as $tag ) {
            if ( stripos( $link, $tag ) !== false ) continue 2;
        }
        $result[] = $link;
    }
    return $result;
}
add_filter( "term_links-post_tag", 'mytheme_filter_tags', 100, 1 );

// do loop stuff
echo get_the_tag_list('<p>Tags: ',', ','</p>');
// end loop stuff

remove_filter( "term_links-post_tag", 'mytheme_filter_tags', 100 );

Answer 2

get_the_tag_list calls get_the_term_list which then calls get_the_terms that has a filter named get_the_terms so you can use that filter to exclude your tags:

//add filter
add_filter( 'get_the_terms', 'exclude_terms_48735', 10, 1 );
//function to do filtering
function exclude_terms_48735( $terms ) {
    //list the unwanted terms ids
    $blacklist_terms = array( 1,2,3);
    // loop through the terms
    foreach( $terms as $k => $term ) {
        //only remove term if it's ID is in the array.
        if(in_array( $term->term_id, $blacklist_terms, true )) 
            unset( $terms[$k] );
    }
    return $terms;
}