gzopen - PHP code example

How to Use the PHP Function GZIP for Compressing Files

PHP has built-in support for reading and writing compressed files using the zlib library. These compressed files can be delivered to the end-users much faster than regular uncompressed data streams, resulting in improved web page loading times for users. The zlib extension contains versions of many file-access functions, such as fopen( ), fread( ) and fwrite( ) that transparently compress data when writing and uncompress data when reading.

The gzopen function opens a gzip-compressed file in read mode. The contents to be written to the gzip-compressed file are stored in a variable called data, and then the gzip-compressed file is closed using gzclose function.

This is a simple php program that uses the gzopen function to open a gzip-compressed file for writing. The contents to be written to the resulting gzip-compressed file are stored as variables, newfile and data. The gzip-compressed file is then closed using gzclose function. The final output of this php program is the gzip-compressed file itself. This is a very handy function for compressing large files, making them smaller and more efficient to deliver over the Internet. This is a great way to save on disk space and make your website more responsive for your visitors. This is a very easy function to use, just plug in your own input and filenames. This function is also highly customizable with a number of different options for error handling and other settings. See the documentation for more information.

gzopen example

$path = parse_url($domain, \PHP_URL_PATH);
        if ($path) {
            $path = str_replace('/', '-', $path);
        }

        $this->domainName = $host . $path;
    }

    private function openGzip(string $filePath): void
    {
        $handle = gzopen($filePath, 'ab');
        if ($handle === false) {
            throw new FileNotReadableException($filePath);
        }

        $this->handle = $handle;
    }
}

    $p_filename = $p_filedescr['filename'];

    // ----- Open the source file     if (($v_file = @fopen($p_filename, "rb")) == 0) {
      PclZip::privErrorLog(PCLZIP_ERR_READ_OPEN_FAIL, "Unable to open file '$p_filename' in binary read mode");
      return PclZip::errorCode();
    }

    // ----- Creates a compressed temporary file     $v_gzip_temp_name = PCLZIP_TEMPORARY_DIR.uniqid('pclzip-').'.gz';
    if (($v_file_compressed = @gzopen($v_gzip_temp_name, "wb")) == 0) {
      fclose($v_file);
      PclZip::privErrorLog(PCLZIP_ERR_WRITE_OPEN_FAIL, 'Unable to open temporary file \''.$v_gzip_temp_name.'\' in binary write mode');
      return PclZip::errorCode();
    }

    // ----- Read the file by PCLZIP_READ_BLOCK_SIZE octets blocks     $v_size = filesize($p_filename);
    while ($v_size != 0) {
      $v_read_size = ($v_size < PCLZIP_READ_BLOCK_SIZE ? $v_size : PCLZIP_READ_BLOCK_SIZE);
      $v_buffer = @fread($v_file, $v_read_size);
      //$v_binary_data = pack('a'.$v_read_size, $v_buffer);

if (\array_key_exists($shopId, $this->files)) {
            return true;
        }

        $filePath = sprintf(
            '%s/sitemap-shop-%d-%s.xml.gz',
            rtrim(sys_get_temp_dir(), '/'),
            $shopId,
            microtime(true) * 10000
        );

        $fileHandler = gzopen($filePath, 'wb');

        if (!$fileHandler) {
            $this->logger->error(sprintf('Could not generate sitemap file, unable to write to "%s"', $filePath));

            return false;
        }

        $this->files[$shopId] = [
            'fileHandle' => $fileHandler,
            'fileName' => $filePath,
            'urlCount' => 0,
        ];

        clearstatcache();
        return @is_file($p_filename) && !@is_link($p_filename);
    }

    /** * @return bool */
    public function _openWrite()
    {
        if ($this->_compress_type == 'gz' && function_exists('gzopen')) {
            $this->_file = @gzopen($this->_tarname, "wb9");
        } else {
            if ($this->_compress_type == 'bz2' && function_exists('bzopen')) {
                $this->_file = @bzopen($this->_tarname, "w");
            } else {
                if ($this->_compress_type == 'lzma2' && function_exists('xzopen')) {
                    $this->_file = @xzopen($this->_tarname, 'w');
                } else {
                    if ($this->_compress_type == 'none') {
                        $this->_file = @fopen($this->_tarname, "wb");
                    } else {
                        $this->_error(