gzencode
(PHP 4 >= 4.0.4, PHP 5)
gzencode — Create a gzip compressed string
说明
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).
参数
- 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.
返回值
The encoded string, or FALSE if an error occurred.
更新日志
| 版本 | 说明 |
|---|---|
| 4.2.0 | The encoding_mode parameter was added |
范例
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);
?>
