get_term_feed_link

The timeline below displays how wordpress function get_term_feed_link has changed across different WordPress versions. If a version is not listed, refer to the next available version below.

WordPress Version: 6.1

/**
 * Retrieves the feed link for a term.
 *
 * Returns a link to the feed for all posts in a given term. A specific feed
 * can be requested or left blank to get the default feed.
 *
 * @since 3.0.0
 *
 * @param int|WP_Term|object $term     The ID or term object whose feed link will be retrieved.
 * @param string             $taxonomy Optional. Taxonomy of `$term_id`.
 * @param string             $feed     Optional. Feed type. Possible values include 'rss2', 'atom'.
 *                                     Default is the value of get_default_feed().
 * @return string|false Link to the feed for the term specified by `$term` and `$taxonomy`.
 */
function get_term_feed_link($term, $taxonomy = '', $feed = '')
{
    if (!is_object($term)) {
        $term = (int) $term;
    }
    $term = get_term($term, $taxonomy);
    if (empty($term) || is_wp_error($term)) {
        return false;
    }
    $taxonomy = $term->taxonomy;
    if (empty($feed)) {
        $feed = get_default_feed();
    }
    $permalink_structure = get_option('permalink_structure');
    if (!$permalink_structure) {
        if ('category' === $taxonomy) {
            $link = home_url("?feed={$feed}&cat={$term->term_id}");
        } elseif ('post_tag' === $taxonomy) {
            $link = home_url("?feed={$feed}&tag={$term->slug}");
        } else {
            $t = get_taxonomy($taxonomy);
            $link = home_url("?feed={$feed}&{$t->query_var}={$term->slug}");
        }
    } else {
        $link = get_term_link($term, $term->taxonomy);
        if (get_default_feed() == $feed) {
            $feed_link = 'feed';
        } else {
            $feed_link = "feed/{$feed}";
        }
        $link = trailingslashit($link) . user_trailingslashit($feed_link, 'feed');
    }
    if ('category' === $taxonomy) {
        /**
         * Filters the category feed link.
         *
         * @since 1.5.1
         *
         * @param string $link The category feed link.
         * @param string $feed Feed type. Possible values include 'rss2', 'atom'.
         */
        $link = apply_filters('category_feed_link', $link, $feed);
    } elseif ('post_tag' === $taxonomy) {
        /**
         * Filters the post tag feed link.
         *
         * @since 2.3.0
         *
         * @param string $link The tag feed link.
         * @param string $feed Feed type. Possible values include 'rss2', 'atom'.
         */
        $link = apply_filters('tag_feed_link', $link, $feed);
    } else {
        /**
         * Filters the feed link for a taxonomy other than 'category' or 'post_tag'.
         *
         * @since 3.0.0
         *
         * @param string $link     The taxonomy feed link.
         * @param string $feed     Feed type. Possible values include 'rss2', 'atom'.
         * @param string $taxonomy The taxonomy name.
         */
        $link = apply_filters('taxonomy_feed_link', $link, $feed, $taxonomy);
    }
    return $link;
}

WordPress Version: 5.9

/**
 * Retrieves the feed link for a term.
 *
 * Returns a link to the feed for all posts in a given term. A specific feed
 * can be requested or left blank to get the default feed.
 *
 * @since 3.0.0
 *
 * @param int|WP_Term|object $term     The ID or term object whose feed link will be retrieved.
 * @param string             $taxonomy Optional. Taxonomy of `$term_id`.
 * @param string             $feed     Optional. Feed type. Possible values include 'rss2', 'atom'.
 *                                     Default is the value of get_default_feed().
 * @return string|false Link to the feed for the term specified by $term_id and $taxonomy.
 */
function get_term_feed_link($term, $taxonomy = '', $feed = '')
{
    if (!is_object($term)) {
        $term = (int) $term;
    }
    $term = get_term($term, $taxonomy);
    if (empty($term) || is_wp_error($term)) {
        return false;
    }
    $taxonomy = $term->taxonomy;
    if (empty($feed)) {
        $feed = get_default_feed();
    }
    $permalink_structure = get_option('permalink_structure');
    if (!$permalink_structure) {
        if ('category' === $taxonomy) {
            $link = home_url("?feed={$feed}&cat={$term->term_id}");
        } elseif ('post_tag' === $taxonomy) {
            $link = home_url("?feed={$feed}&tag={$term->slug}");
        } else {
            $t = get_taxonomy($taxonomy);
            $link = home_url("?feed={$feed}&{$t->query_var}={$term->slug}");
        }
    } else {
        $link = get_term_link($term, $term->taxonomy);
        if (get_default_feed() == $feed) {
            $feed_link = 'feed';
        } else {
            $feed_link = "feed/{$feed}";
        }
        $link = trailingslashit($link) . user_trailingslashit($feed_link, 'feed');
    }
    if ('category' === $taxonomy) {
        /**
         * Filters the category feed link.
         *
         * @since 1.5.1
         *
         * @param string $link The category feed link.
         * @param string $feed Feed type. Possible values include 'rss2', 'atom'.
         */
        $link = apply_filters('category_feed_link', $link, $feed);
    } elseif ('post_tag' === $taxonomy) {
        /**
         * Filters the post tag feed link.
         *
         * @since 2.3.0
         *
         * @param string $link The tag feed link.
         * @param string $feed Feed type. Possible values include 'rss2', 'atom'.
         */
        $link = apply_filters('tag_feed_link', $link, $feed);
    } else {
        /**
         * Filters the feed link for a taxonomy other than 'category' or 'post_tag'.
         *
         * @since 3.0.0
         *
         * @param string $link     The taxonomy feed link.
         * @param string $feed     Feed type. Possible values include 'rss2', 'atom'.
         * @param string $taxonomy The taxonomy name.
         */
        $link = apply_filters('taxonomy_feed_link', $link, $feed, $taxonomy);
    }
    return $link;
}

WordPress Version: 5.5

/**
 * Retrieves the feed link for a term.
 *
 * Returns a link to the feed for all posts in a given term. A specific feed
 * can be requested or left blank to get the default feed.
 *
 * @since 3.0.0
 *
 * @param int    $term_id  Term ID.
 * @param string $taxonomy Optional. Taxonomy of `$term_id`. Default 'category'.
 * @param string $feed     Optional. Feed type. Possible values include 'rss2', 'atom'.
 *                         Default is the value of get_default_feed().
 * @return string|false Link to the feed for the term specified by $term_id and $taxonomy.
 */
function get_term_feed_link($term_id, $taxonomy = 'category', $feed = '')
{
    $term_id = (int) $term_id;
    $term = get_term($term_id, $taxonomy);
    if (empty($term) || is_wp_error($term)) {
        return false;
    }
    if (empty($feed)) {
        $feed = get_default_feed();
    }
    $permalink_structure = get_option('permalink_structure');
    if (!$permalink_structure) {
        if ('category' === $taxonomy) {
            $link = home_url("?feed={$feed}&cat={$term_id}");
        } elseif ('post_tag' === $taxonomy) {
            $link = home_url("?feed={$feed}&tag={$term->slug}");
        } else {
            $t = get_taxonomy($taxonomy);
            $link = home_url("?feed={$feed}&{$t->query_var}={$term->slug}");
        }
    } else {
        $link = get_term_link($term_id, $term->taxonomy);
        if (get_default_feed() == $feed) {
            $feed_link = 'feed';
        } else {
            $feed_link = "feed/{$feed}";
        }
        $link = trailingslashit($link) . user_trailingslashit($feed_link, 'feed');
    }
    if ('category' === $taxonomy) {
        /**
         * Filters the category feed link.
         *
         * @since 1.5.1
         *
         * @param string $link The category feed link.
         * @param string $feed Feed type. Possible values include 'rss2', 'atom'.
         */
        $link = apply_filters('category_feed_link', $link, $feed);
    } elseif ('post_tag' === $taxonomy) {
        /**
         * Filters the post tag feed link.
         *
         * @since 2.3.0
         *
         * @param string $link The tag feed link.
         * @param string $feed Feed type. Possible values include 'rss2', 'atom'.
         */
        $link = apply_filters('tag_feed_link', $link, $feed);
    } else {
        /**
         * Filters the feed link for a taxonomy other than 'category' or 'post_tag'.
         *
         * @since 3.0.0
         *
         * @param string $link     The taxonomy feed link.
         * @param string $feed     Feed type. Possible values include 'rss2', 'atom'.
         * @param string $taxonomy The taxonomy name.
         */
        $link = apply_filters('taxonomy_feed_link', $link, $feed, $taxonomy);
    }
    return $link;
}

WordPress Version: 5.4

/**
 * Retrieves the feed link for a term.
 *
 * Returns a link to the feed for all posts in a given term. A specific feed
 * can be requested or left blank to get the default feed.
 *
 * @since 3.0.0
 *
 * @param int    $term_id  Term ID.
 * @param string $taxonomy Optional. Taxonomy of `$term_id`. Default 'category'.
 * @param string $feed     Optional. Feed type. Possible values include 'rss2', 'atom'.
 *                         Default is the value of get_default_feed().
 * @return string|false Link to the feed for the term specified by $term_id and $taxonomy.
 */
function get_term_feed_link($term_id, $taxonomy = 'category', $feed = '')
{
    $term_id = (int) $term_id;
    $term = get_term($term_id, $taxonomy);
    if (empty($term) || is_wp_error($term)) {
        return false;
    }
    if (empty($feed)) {
        $feed = get_default_feed();
    }
    $permalink_structure = get_option('permalink_structure');
    if ('' == $permalink_structure) {
        if ('category' == $taxonomy) {
            $link = home_url("?feed={$feed}&cat={$term_id}");
        } elseif ('post_tag' == $taxonomy) {
            $link = home_url("?feed={$feed}&tag={$term->slug}");
        } else {
            $t = get_taxonomy($taxonomy);
            $link = home_url("?feed={$feed}&{$t->query_var}={$term->slug}");
        }
    } else {
        $link = get_term_link($term_id, $term->taxonomy);
        if (get_default_feed() == $feed) {
            $feed_link = 'feed';
        } else {
            $feed_link = "feed/{$feed}";
        }
        $link = trailingslashit($link) . user_trailingslashit($feed_link, 'feed');
    }
    if ('category' == $taxonomy) {
        /**
         * Filters the category feed link.
         *
         * @since 1.5.1
         *
         * @param string $link The category feed link.
         * @param string $feed Feed type. Possible values include 'rss2', 'atom'.
         */
        $link = apply_filters('category_feed_link', $link, $feed);
    } elseif ('post_tag' == $taxonomy) {
        /**
         * Filters the post tag feed link.
         *
         * @since 2.3.0
         *
         * @param string $link The tag feed link.
         * @param string $feed Feed type. Possible values include 'rss2', 'atom'.
         */
        $link = apply_filters('tag_feed_link', $link, $feed);
    } else {
        /**
         * Filters the feed link for a taxonomy other than 'category' or 'post_tag'.
         *
         * @since 3.0.0
         *
         * @param string $link     The taxonomy feed link.
         * @param string $feed     Feed type. Possible values include 'rss2', 'atom'.
         * @param string $taxonomy The taxonomy name.
         */
        $link = apply_filters('taxonomy_feed_link', $link, $feed, $taxonomy);
    }
    return $link;
}

WordPress Version: 5.3

/**
 * Retrieves the feed link for a term.
 *
 * Returns a link to the feed for all posts in a given term. A specific feed
 * can be requested or left blank to get the default feed.
 *
 * @since 3.0.0
 *
 * @param int    $term_id  Term ID.
 * @param string $taxonomy Optional. Taxonomy of `$term_id`. Default 'category'.
 * @param string $feed     Optional. Feed type. Possible values include 'rss2', 'atom'.
 *                         Default is the value of get_default_feed().
 * @return string|false Link to the feed for the term specified by $term_id and $taxonomy.
 */
function get_term_feed_link($term_id, $taxonomy = 'category', $feed = '')
{
    $term_id = (int) $term_id;
    $term = get_term($term_id, $taxonomy);
    if (empty($term) || is_wp_error($term)) {
        return false;
    }
    if (empty($feed)) {
        $feed = get_default_feed();
    }
    $permalink_structure = get_option('permalink_structure');
    if ('' == $permalink_structure) {
        if ('category' == $taxonomy) {
            $link = home_url("?feed={$feed}&cat={$term_id}");
        } elseif ('post_tag' == $taxonomy) {
            $link = home_url("?feed={$feed}&tag={$term->slug}");
        } else {
            $t = get_taxonomy($taxonomy);
            $link = home_url("?feed={$feed}&{$t->query_var}={$term->slug}");
        }
    } else {
        $link = get_term_link($term_id, $term->taxonomy);
        if ($feed == get_default_feed()) {
            $feed_link = 'feed';
        } else {
            $feed_link = "feed/{$feed}";
        }
        $link = trailingslashit($link) . user_trailingslashit($feed_link, 'feed');
    }
    if ('category' == $taxonomy) {
        /**
         * Filters the category feed link.
         *
         * @since 1.5.1
         *
         * @param string $link The category feed link.
         * @param string $feed Feed type. Possible values include 'rss2', 'atom'.
         */
        $link = apply_filters('category_feed_link', $link, $feed);
    } elseif ('post_tag' == $taxonomy) {
        /**
         * Filters the post tag feed link.
         *
         * @since 2.3.0
         *
         * @param string $link The tag feed link.
         * @param string $feed Feed type. Possible values include 'rss2', 'atom'.
         */
        $link = apply_filters('tag_feed_link', $link, $feed);
    } else {
        /**
         * Filters the feed link for a taxonomy other than 'category' or 'post_tag'.
         *
         * @since 3.0.0
         *
         * @param string $link     The taxonomy feed link.
         * @param string $feed     Feed type. Possible values include 'rss2', 'atom'.
         * @param string $taxonomy The taxonomy name.
         */
        $link = apply_filters('taxonomy_feed_link', $link, $feed, $taxonomy);
    }
    return $link;
}

WordPress Version: 4.8

/**
 * Retrieves the feed link for a term.
 *
 * Returns a link to the feed for all posts in a given term. A specific feed
 * can be requested or left blank to get the default feed.
 *
 * @since 3.0.0
 *
 * @param int    $term_id  Term ID.
 * @param string $taxonomy Optional. Taxonomy of `$term_id`. Default 'category'.
 * @param string $feed     Optional. Feed type. Default empty.
 * @return string|false Link to the feed for the term specified by $term_id and $taxonomy.
 */
function get_term_feed_link($term_id, $taxonomy = 'category', $feed = '')
{
    $term_id = (int) $term_id;
    $term = get_term($term_id, $taxonomy);
    if (empty($term) || is_wp_error($term)) {
        return false;
    }
    if (empty($feed)) {
        $feed = get_default_feed();
    }
    $permalink_structure = get_option('permalink_structure');
    if ('' == $permalink_structure) {
        if ('category' == $taxonomy) {
            $link = home_url("?feed={$feed}&cat={$term_id}");
        } elseif ('post_tag' == $taxonomy) {
            $link = home_url("?feed={$feed}&tag={$term->slug}");
        } else {
            $t = get_taxonomy($taxonomy);
            $link = home_url("?feed={$feed}&{$t->query_var}={$term->slug}");
        }
    } else {
        $link = get_term_link($term_id, $term->taxonomy);
        if ($feed == get_default_feed()) {
            $feed_link = 'feed';
        } else {
            $feed_link = "feed/{$feed}";
        }
        $link = trailingslashit($link) . user_trailingslashit($feed_link, 'feed');
    }
    if ('category' == $taxonomy) {
        /**
         * Filters the category feed link.
         *
         * @since 1.5.1
         *
         * @param string $link The category feed link.
         * @param string $feed Feed type.
         */
        $link = apply_filters('category_feed_link', $link, $feed);
    } elseif ('post_tag' == $taxonomy) {
        /**
         * Filters the post tag feed link.
         *
         * @since 2.3.0
         *
         * @param string $link The tag feed link.
         * @param string $feed Feed type.
         */
        $link = apply_filters('tag_feed_link', $link, $feed);
    } else {
        /**
         * Filters the feed link for a taxonomy other than 'category' or 'post_tag'.
         *
         * @since 3.0.0
         *
         * @param string $link The taxonomy feed link.
         * @param string $feed Feed type.
         * @param string $taxonomy The taxonomy name.
         */
        $link = apply_filters('taxonomy_feed_link', $link, $feed, $taxonomy);
    }
    return $link;
}

WordPress Version: 4.6

/**
 * Retrieves the feed link for a term.
 *
 * Returns a link to the feed for all posts in a given term. A specific feed
 * can be requested or left blank to get the default feed.
 *
 * @since 3.0.0
 *
 * @param int    $term_id  Term ID.
 * @param string $taxonomy Optional. Taxonomy of `$term_id`. Default 'category'.
 * @param string $feed     Optional. Feed type. Default empty.
 * @return string|false Link to the feed for the term specified by $term_id and $taxonomy.
 */
function get_term_feed_link($term_id, $taxonomy = 'category', $feed = '')
{
    $term_id = (int) $term_id;
    $term = get_term($term_id, $taxonomy);
    if (empty($term) || is_wp_error($term)) {
        return false;
    }
    if (empty($feed)) {
        $feed = get_default_feed();
    }
    $permalink_structure = get_option('permalink_structure');
    if ('' == $permalink_structure) {
        if ('category' == $taxonomy) {
            $link = home_url("?feed={$feed}&cat={$term_id}");
        } elseif ('post_tag' == $taxonomy) {
            $link = home_url("?feed={$feed}&tag={$term->slug}");
        } else {
            $t = get_taxonomy($taxonomy);
            $link = home_url("?feed={$feed}&{$t->query_var}={$term->slug}");
        }
    } else {
        $link = get_term_link($term_id, $term->taxonomy);
        if ($feed == get_default_feed()) {
            $feed_link = 'feed';
        } else {
            $feed_link = "feed/{$feed}";
        }
        $link = trailingslashit($link) . user_trailingslashit($feed_link, 'feed');
    }
    if ('category' == $taxonomy) {
        /**
         * Filters the category feed link.
         *
         * @since 1.5.1
         *
         * @param string $link The category feed link.
         * @param string $feed Feed type.
         */
        $link = apply_filters('category_feed_link', $link, $feed);
    } elseif ('post_tag' == $taxonomy) {
        /**
         * Filters the post tag feed link.
         *
         * @since 2.3.0
         *
         * @param string $link The tag feed link.
         * @param string $feed Feed type.
         */
        $link = apply_filters('tag_feed_link', $link, $feed);
    } else {
        /**
         * Filters the feed link for a taxonomy other than 'category' or 'post_tag'.
         *
         * @since 3.0.0
         *
         * @param string $link The taxonomy feed link.
         * @param string $feed Feed type.
         * @param string $feed The taxonomy name.
         */
        $link = apply_filters('taxonomy_feed_link', $link, $feed, $taxonomy);
    }
    return $link;
}

WordPress Version: 4.5

/**
 * Retrieve the feed link for a term.
 *
 * Returns a link to the feed for all posts in a given term. A specific feed
 * can be requested or left blank to get the default feed.
 *
 * @since 3.0.0
 *
 * @param int    $term_id  ID of a category.
 * @param string $taxonomy Optional. Taxonomy of $term_id
 * @param string $feed     Optional. Feed type.
 * @return string|false Link to the feed for the term specified by $term_id and $taxonomy.
 */
function get_term_feed_link($term_id, $taxonomy = 'category', $feed = '')
{
    $term_id = (int) $term_id;
    $term = get_term($term_id, $taxonomy);
    if (empty($term) || is_wp_error($term)) {
        return false;
    }
    if (empty($feed)) {
        $feed = get_default_feed();
    }
    $permalink_structure = get_option('permalink_structure');
    if ('' == $permalink_structure) {
        if ('category' == $taxonomy) {
            $link = home_url("?feed={$feed}&cat={$term_id}");
        } elseif ('post_tag' == $taxonomy) {
            $link = home_url("?feed={$feed}&tag={$term->slug}");
        } else {
            $t = get_taxonomy($taxonomy);
            $link = home_url("?feed={$feed}&{$t->query_var}={$term->slug}");
        }
    } else {
        $link = get_term_link($term_id, $term->taxonomy);
        if ($feed == get_default_feed()) {
            $feed_link = 'feed';
        } else {
            $feed_link = "feed/{$feed}";
        }
        $link = trailingslashit($link) . user_trailingslashit($feed_link, 'feed');
    }
    if ('category' == $taxonomy) {
        /**
         * Filter the category feed link.
         *
         * @since 1.5.1
         *
         * @param string $link The category feed link.
         * @param string $feed Feed type.
         */
        $link = apply_filters('category_feed_link', $link, $feed);
    } elseif ('post_tag' == $taxonomy) {
        /**
         * Filter the post tag feed link.
         *
         * @since 2.3.0
         *
         * @param string $link The tag feed link.
         * @param string $feed Feed type.
         */
        $link = apply_filters('tag_feed_link', $link, $feed);
    } else {
        /**
         * Filter the feed link for a taxonomy other than 'category' or 'post_tag'.
         *
         * @since 3.0.0
         *
         * @param string $link The taxonomy feed link.
         * @param string $feed Feed type.
         * @param string $feed The taxonomy name.
         */
        $link = apply_filters('taxonomy_feed_link', $link, $feed, $taxonomy);
    }
    return $link;
}

WordPress Version: 4.3

/**
 * Retrieve the feed link for a term.
 *
 * Returns a link to the feed for all posts in a given term. A specific feed
 * can be requested or left blank to get the default feed.
 *
 * @since 3.0.0
 *
 * @param int    $term_id  ID of a category.
 * @param string $taxonomy Optional. Taxonomy of $term_id
 * @param string $feed     Optional. Feed type.
 * @return string|false Link to the feed for the term specified by $term_id and $taxonomy.
*/
function get_term_feed_link($term_id, $taxonomy = 'category', $feed = '')
{
    $term_id = (int) $term_id;
    $term = get_term($term_id, $taxonomy);
    if (empty($term) || is_wp_error($term)) {
        return false;
    }
    if (empty($feed)) {
        $feed = get_default_feed();
    }
    $permalink_structure = get_option('permalink_structure');
    if ('' == $permalink_structure) {
        if ('category' == $taxonomy) {
            $link = home_url("?feed={$feed}&cat={$term_id}");
        } elseif ('post_tag' == $taxonomy) {
            $link = home_url("?feed={$feed}&tag={$term->slug}");
        } else {
            $t = get_taxonomy($taxonomy);
            $link = home_url("?feed={$feed}&{$t->query_var}={$term->slug}");
        }
    } else {
        $link = get_term_link($term_id, $term->taxonomy);
        if ($feed == get_default_feed()) {
            $feed_link = 'feed';
        } else {
            $feed_link = "feed/{$feed}";
        }
        $link = trailingslashit($link) . user_trailingslashit($feed_link, 'feed');
    }
    if ('category' == $taxonomy) {
        /**
         * Filter the category feed link.
         *
         * @since 1.5.1
         *
         * @param string $link The category feed link.
         * @param string $feed Feed type.
         */
        $link = apply_filters('category_feed_link', $link, $feed);
    } elseif ('post_tag' == $taxonomy) {
        /**
         * Filter the post tag feed link.
         *
         * @since 2.3.0
         *
         * @param string $link The tag feed link.
         * @param string $feed Feed type.
         */
        $link = apply_filters('tag_feed_link', $link, $feed);
    } else {
        /**
         * Filter the feed link for a taxonomy other than 'category' or 'post_tag'.
         *
         * @since 3.0.0
         *
         * @param string $link The taxonomy feed link.
         * @param string $feed Feed type.
         * @param string $feed The taxonomy name.
         */
        $link = apply_filters('taxonomy_feed_link', $link, $feed, $taxonomy);
    }
    return $link;
}

WordPress Version: 3.9

/**
 * Retrieve the feed link for a term.
 *
 * Returns a link to the feed for all posts in a given term. A specific feed
 * can be requested or left blank to get the default feed.
 *
 * @since 3.0.0
 *
 * @param int $term_id ID of a category.
 * @param string $taxonomy Optional. Taxonomy of $term_id
 * @param string $feed Optional. Feed type.
 * @return string Link to the feed for the term specified by $term_id and $taxonomy.
*/
function get_term_feed_link($term_id, $taxonomy = 'category', $feed = '')
{
    $term_id = (int) $term_id;
    $term = get_term($term_id, $taxonomy);
    if (empty($term) || is_wp_error($term)) {
        return false;
    }
    if (empty($feed)) {
        $feed = get_default_feed();
    }
    $permalink_structure = get_option('permalink_structure');
    if ('' == $permalink_structure) {
        if ('category' == $taxonomy) {
            $link = home_url("?feed={$feed}&cat={$term_id}");
        } elseif ('post_tag' == $taxonomy) {
            $link = home_url("?feed={$feed}&tag={$term->slug}");
        } else {
            $t = get_taxonomy($taxonomy);
            $link = home_url("?feed={$feed}&{$t->query_var}={$term->slug}");
        }
    } else {
        $link = get_term_link($term_id, $term->taxonomy);
        if ($feed == get_default_feed()) {
            $feed_link = 'feed';
        } else {
            $feed_link = "feed/{$feed}";
        }
        $link = trailingslashit($link) . user_trailingslashit($feed_link, 'feed');
    }
    if ('category' == $taxonomy) {
        /**
         * Filter the category feed link.
         *
         * @since 1.5.1
         *
         * @param string $link The category feed link.
         * @param string $feed Feed type.
         */
        $link = apply_filters('category_feed_link', $link, $feed);
    } elseif ('post_tag' == $taxonomy) {
        /**
         * Filter the post tag feed link.
         *
         * @since 2.3.0
         *
         * @param string $link The tag feed link.
         * @param string $feed Feed type.
         */
        $link = apply_filters('tag_feed_link', $link, $feed);
    } else {
        /**
         * Filter the feed link for a taxonomy other than 'category' or 'post_tag'.
         *
         * @since 3.0.0
         *
         * @param string $link The taxonomy feed link.
         * @param string $feed Feed type.
         * @param string $feed The taxonomy name.
         */
        $link = apply_filters('taxonomy_feed_link', $link, $feed, $taxonomy);
    }
    return $link;
}

WordPress Version: 3.7

/**
 * Retrieve the feed link for a term.
 *
 * Returns a link to the feed for all posts in a given term. A specific feed
 * can be requested or left blank to get the default feed.
 *
 * @since 3.0
 *
 * @param int $term_id ID of a category.
 * @param string $taxonomy Optional. Taxonomy of $term_id
 * @param string $feed Optional. Feed type.
 * @return string Link to the feed for the term specified by $term_id and $taxonomy.
*/
function get_term_feed_link($term_id, $taxonomy = 'category', $feed = '')
{
    $term_id = (int) $term_id;
    $term = get_term($term_id, $taxonomy);
    if (empty($term) || is_wp_error($term)) {
        return false;
    }
    if (empty($feed)) {
        $feed = get_default_feed();
    }
    $permalink_structure = get_option('permalink_structure');
    if ('' == $permalink_structure) {
        if ('category' == $taxonomy) {
            $link = home_url("?feed={$feed}&cat={$term_id}");
        } elseif ('post_tag' == $taxonomy) {
            $link = home_url("?feed={$feed}&tag={$term->slug}");
        } else {
            $t = get_taxonomy($taxonomy);
            $link = home_url("?feed={$feed}&{$t->query_var}={$term->slug}");
        }
    } else {
        $link = get_term_link($term_id, $term->taxonomy);
        if ($feed == get_default_feed()) {
            $feed_link = 'feed';
        } else {
            $feed_link = "feed/{$feed}";
        }
        $link = trailingslashit($link) . user_trailingslashit($feed_link, 'feed');
    }
    if ('category' == $taxonomy) {
        $link = apply_filters('category_feed_link', $link, $feed);
    } elseif ('post_tag' == $taxonomy) {
        $link = apply_filters('tag_feed_link', $link, $feed);
    } else {
        $link = apply_filters('taxonomy_feed_link', $link, $feed, $taxonomy);
    }
    return $link;
}