PHPOffice / PhpSpreadsheet

                } else {

                    // ----- Use "in memory" zip algo

                    // ----- Open the source file

                    if (($v_file = @fopen($p_filename, 'rb')) == 0) {

                        self::privErrorLog(PCLZIP_ERR_READ_OPEN_FAIL, "Unable to open file '$p_filename' in binary read mode");

                        return self::errorCode();

                    }

                    // ----- Read the file content

                    $v_content = @fread($v_file, $p_header['size']);

        $p_filename = $p_filedescr['filename'];

        // ----- Open the source file

        if (($v_file = @fopen($p_filename, 'rb')) == 0) {

            self::privErrorLog(PCLZIP_ERR_READ_OPEN_FAIL, "Unable to open file '$p_filename' in binary read mode");

            return self::errorCode();

        }

        // ----- Creates a compressed temporary file

        $v_gzip_temp_name = PCLZIP_TEMPORARY_DIR . uniqid('pclzip-') . '.gz';

        }

        // ----- Extract the compressed attributes

        if (($v_file_compressed = @fopen($v_gzip_temp_name, 'rb')) == 0) {

            self::privErrorLog(PCLZIP_ERR_READ_OPEN_FAIL, 'Unable to open temporary file \'' . $v_gzip_temp_name . '\' in binary read mode');

            return self::errorCode();

        }

        // ----- Read the gzip file header

        $v_binary_data = @fread($v_file_compressed, 10);

        }

        // ----- Add the compressed data

        if (($v_file_compressed = @fopen($v_gzip_temp_name, 'rb')) == 0) {

            self::privErrorLog(PCLZIP_ERR_READ_OPEN_FAIL, 'Unable to open temporary file \'' . $v_gzip_temp_name . '\' in binary read mode');

            return self::errorCode();

        }

        // ----- Read the file by PCLZIP_READ_BLOCK_SIZE octets blocks

        fseek($v_file_compressed, 10);

        }

        // ----- Open the temporary file in write mode

        if (($v_zip_temp_fd = @fopen($p_archive_filename, 'rb')) == 0) {

            $this->privCloseFd();

            self::privErrorLog(PCLZIP_ERR_READ_OPEN_FAIL, 'Unable to open archive file \'' . $p_archive_filename . '\' in binary write mode');

            // ----- Return

            return self::errorCode();

        }

        // ----- Copy the files from the archive to the temporary file

        // TBC : Here I should better append the file and go back to erase the central dir