dosamigos\taggable\Taggable::afterSave PHP Method

    public function afterSave($event)
    {
        if ($this->tagValues === null) {
            $this->tagValues = $this->owner->{$this->attribute};
        }
        if (!$this->owner->getIsNewRecord()) {
            $this->beforeDelete($event);
        }
        $names = array_unique(preg_split('/\\s*,\\s*/u', preg_replace('/\\s+/u', ' ', is_array($this->tagValues) ? implode(',', $this->tagValues) : $this->tagValues), -1, PREG_SPLIT_NO_EMPTY));
        $relation = $this->owner->getRelation($this->relation);
        $pivot = $relation->via->from[0];
        /** @var ActiveRecord $class */
        $class = $relation->modelClass;
        $rows = [];
        $updatedTags = [];
        foreach ($names as $name) {
            $tag = $class::findOne([$this->name => $name]);
            if ($tag === null) {
                $tag = new $class();
                $tag->{$this->name} = $name;
            }
            $tag->{$this->frequency}++;
            if ($tag->save()) {
                $updatedTags[] = $tag;
                $rows[] = [$this->owner->getPrimaryKey(), $tag->getPrimaryKey()];
            }
        }
        if (!empty($rows)) {
            $this->owner->getDb()->createCommand()->batchInsert($pivot, [key($relation->via->link), current($relation->link)], $rows)->execute();
        }
        $this->owner->populateRelation($this->relation, $updatedTags);
    }