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PHP Manual :: gzencode

gzdeflate || gzeof || Zlib Functions || PHP Manual

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

gzencodeCreate a gzip compressed string


string gzencode ( string $data [, int $level = -1 [, int $encoding_mode = FORCE_GZIP ]] )

This function returns a compressed version of the input data compatible with the output of the gzip program.

For more information on the GZIP file format, see the document: » GZIP file format specification version 4.3 (RFC 1952).



The data to encode.


The level of compression. 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.


The encoding mode. Can be FORCE_GZIP (the default) or FORCE_DEFLATE.

Prior to PHP 5.4.0, using FORCE_DEFLATE results in a standard zlib deflated string (inclusive zlib headers) after a gzip file header but without the trailing crc32 checksum.

In PHP 5.4.0 and later, FORCE_DEFLATE generates RFC 1950 compliant output, consisting of a zlib header, the deflated data, and an Adler checksum.

Return Values

The encoded string, or FALSE if an error occurred.


Version Description
5.4.0 FORCE_DEFLATE now generates RFC 1950 compliant output.


The resulting data contains the appropriate headers and data structure to make a standard .gz file, e.g.:

Example #1 Creating a gzip file

$gzdata gzencode($data9);
$fp fopen("bigfile.txt.gz""w");

See Also

gzdeflate || gzeof || Zlib Functions || PHP Manual
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