src/TaggableBehavior.php
public function removeTagValues($tags)
    {
        $this->_tagsList = array_diff($this->getTagValues(), $this->parseTags($tags));
        $this->updateOwnerTags();
    }
public function removeTagValues($tags)
    {
        $this->_tagsList = array_diff($this->getTagValues(), $this->parseTags($tags));
        $this->updateOwnerTags();
    }
Removes the specified tags from the list
@param string|string[] $tags the list of removed tags. If specified as a string, the tags must be separated by commas