Method tagItem

/**
 * Method to add or update tags associated with an item.
 *
 * @param   integer         $ucmId    Id of the #__ucm_content item being tagged
 * @param   TableInterface  $table    Table object being tagged
 * @param   array           $tags     Array of tags to be applied.
 * @param   boolean         $replace  Flag indicating if all existing tags should be replaced
 *
 * @return  boolean  true on success, otherwise false.
 *
 * @since   3.1
 */
public function tagItem($ucmId, TableInterface $table, $tags = array(), $replace = true)
{
    $key = $table->get('_tbl_key');
    $oldTags = $this->getTagIds((int) $table->{$key}, $this->typeAlias);
    $oldTags = explode(',', $oldTags);
    $result = $this->unTagItem($ucmId, $table);
    if ($replace) {
        $newTags = $tags;
    } else {
        if ($tags == array()) {
            $newTags = $table->newTags;
        } else {
            $newTags = $tags;
        }
        if ($oldTags[0] != '') {
            $newTags = array_unique(array_merge($newTags, $oldTags));
        }
    }
    if (\is_array($newTags) && \count($newTags) > 0 && $newTags[0] != '') {
        $result = $result && $this->addTagMapping($ucmId, $table, $newTags);
    }
    return $result;
}