gzdecode
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().
gzdeflate
(PHP 4 >= 4.0.4, PHP 5)
gzdeflate — Komprimiert eine Zeichenkette
Beschreibung
string gzdeflate
( string
$data
[, int $level = -1
] )Diese Funktion komprimiert die übergebene Zeichenkette mit dem DEFLATE Daten Format.
Zu Einzelheiten bezüglich des DEFLATE Kompressions Algorithmus siehe das Dokument "» DEFLATE Compressed Data Format Specification version 1.3" (RFC 1951).
Parameter-Liste
-
data -
Die zu komprimierenden (deflate == entleeren) Daten.
-
level -
Der Komprimierungsfaktor. Kann von 0 für keine Kompression bis 9 für maximale Kompression übergeben werden. Wird er nicht übergeben, ist der Standard Komprimierungsfaktor der Standard Komprimierungsfaktor der zlib Bibliothek.
Rückgabewerte
Die komprimierte (entleerte) Zeichenkette oder FALSE wenn ein Fehler
auftrat.
Beispiele
Beispiel #1 gzdeflate() Beispiel
<?php
$compressed = gzdeflate('Compress me', 9);
echo $compressed;
?>
Siehe auch
- gzinflate() - Dekomprimiere (inflate) eine komprimierte (deflate) Zeichenkette
- gzcompress() - Komprimiert einen String
- gzuncompress() - Dekomprimiert einen komprimierten String
- gzencode() - Create a gzip compressed string
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User Contributed Notes
gzdeflate
robin
26-Feb-2010 06:46
anonymous at php dot net
04-Jun-2009 07:20
gzcompress produces longer data because it embeds information about the encoding onto the string. If you are compressing data that will only ever be handled on one machine, then you don't need to worry about which of these functions you use. However, if you are passing data compressed with these functions to a different machine you should use gzcompress.
tomas at slax dot org
03-Oct-2008 07:13
gzcompress() is the same like gzdefflate(), it produces identical data and its speed is the same as well. The only difference is that gzcompress produces 6 bytes bigger result (2 extra bytes at the beginning and 4 extra bytes at the end).
romain dot lalaut at laposte dot net
08-Oct-2007 09:20
@ giunta dot gaetano at sea-aeroportimilano dot it
No, gzdeflate() implements rfc1951.
And rf2616 (http 1.1 specs) says "deflate : The "zlib" format defined in RFC 1950 [31] in combination with the "deflate" compression mechanism described in RFC 1951 [29]."
giunta dot gaetano at sea-aeroportimilano dot it
21-Aug-2006 07:22
Take care that that "PHP deflate" != "HTTP deflate".
The deflate encoding used in HTTP is actually zlib encoded.
This is what PHP functions return:
gzencode() == gzip
gzcompress() == zlib (aka. HTTP deflate)
gzdeflate() == *raw* deflate encoding
denis dot noessler at red-at dot de
17-Jun-2003 05:26
if you have compressed data which is greater than 2 MB (system dependent), you will receive a buffer error by calling the function gzinflate().
be sure to to compress your data by a lower compression level, like 1.
i.e.: gzdeflate($sData, 1);