Php/docs/function.gzcompress
gzcompress
(PHP 4 >= 4.0.1, PHP 5, PHP 7)
gzcompress — Compress a string
说明
gzcompress
( string $data
[, int $level
= -1
[, int $encoding
= ZLIB_ENCODING_DEFLATE
]] ) : string|false
This function compresses the given string using the ZLIB
data format.
For details on the ZLIB compression algorithm see the document "[http://www.faqs.org/rfcs/rfc1950 » ZLIB Compressed Data Format Specification version 3.3]" (RFC 1950).
Note:
This is not the same as gzip compression, which includes some header data. See gzencode() for gzip compression.
参数
data
The data to compress.
level
The level of compression. Can be given as 0 for no compression up to 9 for maximum compression.
If -1 is used, the default compression of the zlib library is used which is 6.
encoding
One of
ZLIB_ENCODING_*
constants.
返回值
The compressed string or false
if an error occurred.
范例
Example #1 gzcompress() example
<?php$compressed = gzcompress('Compress me', 9);echo $compressed;?>
参见
- gzdeflate() - Deflate a string
- gzinflate() - Inflate a deflated string
- gzuncompress() - Uncompress a compressed string
- gzencode() - Create a gzip compressed string