private function getTemporaryFolder()
    {
        $tempFolder = sys_get_temp_dir() . '/phpspreadsheet';
        if (!is_dir($tempFolder)) {
            if (!mkdir($tempFolder) && !is_dir($tempFolder)) {
                throw new \RuntimeException(sprintf('Directory "%s" was not created', $tempFolder));
            }
        }

        return $tempFolder;
    }
private function getTemporaryFolder()
    {
        $tempFolder = sys_get_temp_dir() . '/phpspreadsheet';
        if (!is_dir($tempFolder)) {
            if (!mkdir($tempFolder) && !is_dir($tempFolder)) {
                throw new \RuntimeException(sprintf('Directory "%s" was not created', $tempFolder));
            }
        }

        return $tempFolder;
    }
private function getTemporaryFolder ( ) { $ tempFolder = sys_get_temp_dir ( ) . '/phpspreadsheet' ; if ( ! is_dir ( $ tempFolder ) ) { if ( ! mkdir ( $ tempFolder ) && ! is_dir ( $ tempFolder ) ) { throw new \ RuntimeException ( sprintf ( 'Directory "%s" was not created' , $ tempFolder ) ) ; } } return $ tempFolder ; }
Returns the temporary directory and make sure it exists.

@return string
Returns the temporary directory and make sure it exists .