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PHP Dokumentation: Function gzencode

12. Januar 2010 von werner

gzencode

(PHP 4 >= 4.0.4, PHP 5)

gzencode — Create a gzip compressed string

Beschreibung

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).

Parameter-Liste

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.

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.

Rückgabewerte

The encoded string, or FALSE if an error occurred.

Changelog

Version	Beschreibung
4.2.0	The `encoding_mode` parameter was added

Beispiele

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

Beispiel #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);
?>