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gzencode
Create a gzip compressed string
(PHP 4 >= 4.0.4, PHP 5)
string gzencode ( string data [, int level [, int encoding_mode]] )
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).
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) orFORCE_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.
Examples
The resulting data contains the appropriate headers and data structure to make a standard .gz file, e.g.:
Example 2723. 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);
?>