public function append($content = null)
        {
            if (null === $content) {
                return;
            } else if (is_array($content)) {
                foreach ($content as $row) {
                    $this->content[] = $row;
                }
            } else {
                $this->content[] = $content;
            }
            return $this;
        }
public function append($content = null)
        {
            if (null === $content) {
                return;
            } else if (is_array($content)) {
                foreach ($content as $row) {
                    $this->content[] = $row;
                }
            } else {
                $this->content[] = $content;
            }
            return $this;
        }
public function append ( $ content = null ) { if ( null === $ content ) { return ; } else if ( is_array ( $ content ) ) { foreach ( $ content as $ row ) { $ this -> content [ ] = $ row ; } } else { $ this -> content [ ] = $ content ; } return $ this ; }
Append content into an element.

@param mixed $content
@return Element
Append content into an element .