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zlib_encode

(PHP 5 >= 5.4.0)

zlib_encodeCompress data with the specified encoding

Description

string zlib_encode ( string $data , string $encoding [, string $level = -1 ] )

Compress data with the specified encoding.

Warning

This function is currently not documented; only its argument list is available.

Parameters

data

encoding

level

Return Values

See Also

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User Contributed Notes 2 notes

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7
soywiz at gmail dot com
2 years ago
RFC 1950 - zlib
RFC 1951 - raw deflate
RFC 1952 - gzip

The $encoding parameter referers to the window bits. So you can encode in several formats:

<?php

// RFC 1950 - zlib
$compressedData = zlib_encode($uncompressedData, 15);

// RFC 1951 - raw deflate
$compressedData = zlib_encode($uncompressedData, -15);

// RFC 1952 - gzip
$compressedData = zlib_encode($uncompressedData, 31);

?>
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1
mike at technomonk.com
5 months ago
Undocumented constants are:

ZLIB_ENCODING_RAW
ZLIB_ENCODING_GZIP
ZLIB_ENCODING_DEFLATE

Example code:

<?php

$in
='hello world';
$enc=zlib_encode($in, ZLIB_ENCODING_DEFLATE);
echo
zlib_decode($enc);
//outputs 'hello world'
?>
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