public function setMetaSubject(string $str): PdfInterface
    {
        $this->setProperty('metaSubject', $str);
        $this->mpdf->SetSubject($this->metaSubject);

        return $this;
    }
public function setMetaSubject(string $str): PdfInterface
    {
        $this->setProperty('metaSubject', $str);
        $this->mpdf->SetSubject($this->metaSubject);

        return $this;
    }
public function setMetaSubject ( string $ str ) : PdfInterface { $ this -> setProperty ( 'metaSubject' , $ str ) ; $ this -> mpdf -> SetSubject ( $ this -> metaSubject ) ; return $ this ; }
Set PDF Meta Subject.

@param string $str  The page subject

@return PdfInterface The current instance
Set PDF Meta Subject .