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gzencode

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

gzencode — Create a gzip compressed string

Description

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

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).

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Parameters

data

The data to encode.

level

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.

encoding_mode

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.

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Return Values

The encoded string, or FALSE if an error occurred.

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Changelog

Version Description
5.4.0 FORCE_DEFLATE now generates RFC 1950 compliant output.

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Examples

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

Example #1 Creating a gzip file

<?php
$data = implode("", file("bigfile.txt"));
$gzdata = gzencode($data, 9);
$fp = fopen("bigfile.txt.gz", "w");
fwrite($fp, $gzdata);
fclose($fp);
?>

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See Also

Find a PHP function

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Document created the 30/01/2003, last modified the 26/10/2018
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References

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