public function addKeywords($keywords) {
		if (is_string($keywords)) {
			$keywords = explode(',', $keywords);
		}
		
		foreach ($keywords as $keyword) {
			$this->addKeyword($keyword);
		}
		
		return $this;
	}
public function addKeywords($keywords) {
		if (is_string($keywords)) {
			$keywords = explode(',', $keywords);
		}
		
		foreach ($keywords as $keyword) {
			$this->addKeyword($keyword);
		}
		
		return $this;
	}
public function addKeywords ( $ keywords ) { if ( is_string ( $ keywords ) ) { $ keywords = explode ( ',' , $ keywords ) ; } foreach ( $ keywords as $ keyword ) { $ this -> addKeyword ( $ keyword ) ; } return $ this ; }
Add many of the keywords

@param  array | Traversable | string $keywords
@return Head
Add many of the keywords