public function getTemporaryFilename($extension = 'xlsx')
    {
        $temporaryFilename = tempnam($this->getTemporaryFolder(), 'phpspreadsheet-');
        unlink($temporaryFilename);

        return $temporaryFilename . '.' . $extension;
    }
public function getTemporaryFilename($extension = 'xlsx')
    {
        $temporaryFilename = tempnam($this->getTemporaryFolder(), 'phpspreadsheet-');
        unlink($temporaryFilename);

        return $temporaryFilename . '.' . $extension;
    }
public function getTemporaryFilename ( $ extension = 'xlsx' ) { $ temporaryFilename = tempnam ( $ this -> getTemporaryFolder ( ) , 'phpspreadsheet-' ) ; unlink ( $ temporaryFilename ) ; return $ temporaryFilename . '.' . $ extension ; }
Return a random temporary file name.

@param string $extension

@return string
Return a random temporary file name .