gzencode Create a gzip compressed string stringgzencode stringdata intlevel intencoding_mode This function returns a compressed version of the input data compatible with the output of the gzip program, or &false; if an error is encountered. The optional parameter level can be given as 0 for no compression up to 9 for maximum compression, if not given the default compression level will be the default compression level of the zlib library. You can also give FORCE_GZIP (the default) or FORCE_DEFLATE as optional third paramter encoding_mode. If you use FORCE_DEFLATE, you get a standard zlib deflated string (inclusive zlib headers) after the gzip file header but without the trailing crc32 checksum. level was added in PHP 4.2, before PHP 4.2 gzencode only had the data and (optional) encoding_mode parameters.. The resulting data contains the appropriate headers and data structure to make a standard .gz file, e.g.: ]]> For more information on the GZIP file format, see the document: GZIP file format specification version 4.3 (RFC 1952). See also gzcompress. gzuncompress, gzdeflate, gzinflate.