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gzencode (PHP 4 >= 4.0.4, PHP 5) gzencode -- Create a gzip compressed string 说明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).
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.
范例
The resulting data contains the appropriate headers and data
structure to make a standard .gz file, e.g.:
例子 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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