final public function getContent(): string
    {
        if (null === $this->content) {
            $this->content = $this->doGetContent($this->getContentPartNumber());
        }

        return $this->content;
    }
final public function getContent(): string
    {
        if (null === $this->content) {
            $this->content = $this->doGetContent($this->getContentPartNumber());
        }

        return $this->content;
    }
final public function getContent ( ) : string { if ( null === $ this -> content ) { $ this -> content = $ this -> doGetContent ( $ this -> getContentPartNumber ( ) ) ; } return $ this -> content ; }
Get raw part content.

@return string
Get raw part content .