gzcompress
Description
The gzcompress of zlib for PHP compresses a string.
Syntax
gzcompress(
string $data,
int $level = -1,
int $encoding = ZLIB_ENCODING_DEFLATE
): string|falseParameters
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
The encoding mode.
| Constant | Description |
|---|---|
| ZLIB_ENCODING_RAW | DEFLATE algorithm as per RFC 1951. |
| ZLIB_ENCODING_DEFLATE | ZLIB compression algorithm as per RFC 1950. |
| ZLIB_ENCODING_GZIP | GZIP algorithm as per RFC 1952. |
Return
Returns the compressed string or false if an error occurred.
Examples
1 · data
<? $data = "data"; $return = gzcompress($data); echo $return; ?>
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2 · level · 0
<? $data = "data"; $level = 0; $return = gzcompress($data, $level); echo $return; ?>
x ��data �
3 · level · 9
<? $data = "data"; $level = 9; $return = gzcompress($data, $level); echo $return; ?>
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4 · encoding · ZLIB_ENCODING_RAW
<? $data = "data"; $level = -1; $encoding = ZLIB_ENCODING_RAW; $return = gzcompress($data, $level, $encoding); echo $return; ?>
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5 · encoding · ZLIB_ENCODING_DEFLATE
<? $data = "data"; $level = -1; $encoding = ZLIB_ENCODING_DEFLATE; $return = gzcompress($data, $level, $encoding); echo $return; ?>
x�KI,I �
6 · encoding · ZLIB_ENCODING_GZIP
<? $data = "data"; $level = -1; $encoding = ZLIB_ENCODING_GZIP; $return = gzcompress($data, $level, $encoding); echo $return; ?>
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