Take care that that "PHP deflate" != "HTTP deflate".
The deflate encoding used in HTTP is actually zlib encoded.
This is what PHP functions return:
gzencode() == gzip
gzcompress() == zlib (aka. HTTP deflate)
gzdeflate() == *raw* deflate encoding
gzdeflate
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
gzdeflate — Comprime una stringa
Descrizione
gzdeflate(string
$data, int $level = -1, int $encoding = ZLIB_ENCODING_RAW): string|false
Questa funzione comprime la stringa data utilizzando il formato dati
DEFLATE.
Per i dettagli sull'algoritmo di compressione DEFLATE, vedere il documento "» DEFLATE Compressed Data Format Specification version 1.3" (RFC 1951).
Elenco dei parametri
-
data -
I dati da comprimere.
-
level -
Il livello di compressione. Varia tra 0 per nessuna compressione fino a 9 per la compressione massima. Se non viene specificato, il livello di compressione di default sarà quello di default della libreria zlib.
-
encoding -
Una delle costanti
ZLIB_ENCODING_*.
Valori restituiti
La stringa compressa o false in caso di errore.
Esempi
Example #1 Esempio di gzdeflate()
<?php
$compressed = gzdeflate('Comprimimi', 9);
echo $compressed;
?>
Vedere anche:
- gzinflate() - Inflate a deflated string
- gzcompress() - Comprime una stringa
- gzuncompress() - Decomprime una stringa compressa
- gzencode() - Crea una stringa compressa con gzip
add a note
User Contributed Notes 9 notes
giunta dot gaetano at sea-aeroportimilano dot it ¶
16 years ago
anonymous at php dot net ¶
14 years ago
gzcompress produces longer data because it embeds information about the encoding onto the string. If you are compressing data that will only ever be handled on one machine, then you don't need to worry about which of these functions you use. However, if you are passing data compressed with these functions to a different machine you should use gzcompress.
robin ¶
13 years ago
running 50000 repetitions on various content, i found that gzdeflate() and gzcompress() both performed equally fast regardless content and compression level, but gzinflate() was always about twice as fast as gzuncompress().
stockton at wowway dot com ¶
9 years ago
After some searching and experimentation I found that the output from this function cannot be 'inflated' with the objective c 'zlibInflate' wrapper for 'zlib' that is available at http://cocoadev.com/wiki/NSDataCategory but the output from gzcompress() can be. Thank you "anonymous at php dot net" and "tomas at slax dot org" for the clues. I hope this saves someone else the searching.
banditsmile at qq dot com ¶
8 years ago
start from php5.4.0 gzdeflate has the fastest speed and best zip rate.
http://3v4l.org/K2XAf
HUjuice ¶
7 years ago
The HTTP deflate is quite complicated.
The RFC7230, Sec 4.2.2 (https://tools.ietf.org/html/rfc7230#section-4.2.2) says:
«The "deflate" coding is a "zlib" data format [RFC1950] containing a "deflate" compressed data stream [RFC1951] that uses a combination of the Lempel-Ziv (LZ77) compression algorithm and Huffman coding.»
and, also:
«Note: Some non-conformant implementations send the "deflate" compressed data without the zlib wrapper.»
Since this function implements the RFC1951, the compliant encoding of a $payload should be:
gzcompress(gzdeflate($payload));
tomas at slax dot org ¶
14 years ago
gzcompress() is the same like gzdefflate(), it produces identical data and its speed is the same as well. The only difference is that gzcompress produces 6 bytes bigger result (2 extra bytes at the beginning and 4 extra bytes at the end).
denis dot noessler at red-at dot de ¶
19 years ago
if you have compressed data which is greater than 2 MB (system dependent), you will receive a buffer error by calling the function gzinflate().
be sure to to compress your data by a lower compression level, like 1.
i.e.: gzdeflate($sData, 1);
