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 — Comprime una cadena
Descripción
string gzdeflate
( string $data
[, int $level = -1
] )
Esta función comprime la cadena dada utilizando el formato de datos DEFLATE.
Para más detalles sobre el algoritmo de compresión DEFLATE ver el documento "» DEFLATE Compressed Data Format Specification version 1.3" (RFC 1951).
Parámetros
- data
-
Los datos a comprimir.
- level
-
El nivel de compresión. Se puede dar desde 0 para ninguna compresión hasta 9 para máxima compresión. Si no se especifica, se utilizará el nivel de compresión por defecto de la librería zlib.
Valores devueltos
La cadena comprimida o FALSE si ocurre un error.
Ejemplos
Example #1 Ejemplo de gzdeflate()
<?php
$compressed = gzdeflate('Compress me', 9);
echo $compressed;
?>
Ver también
- gzinflate() - Descomprime una cadena comprimida
- gzcompress() - Comprime una cadena
- gzuncompress() - Descomprime una cadena comprimida
- gzencode() - Crea una cadena comprimida con gzip
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User Contributed Notes
gzdeflate
robin
27-Feb-2010 01:46
anonymous at php dot net
05-Jun-2009 12:20
gzcompress produces longer data because it embeds information about the encoding onto the string. If you are compressing data that will only ever be handled on one machine, then you don't need to worry about which of these functions you use. However, if you are passing data compressed with these functions to a different machine you should use gzcompress.
tomas at slax dot org
03-Oct-2008 12:13
gzcompress() is the same like gzdefflate(), it produces identical data and its speed is the same as well. The only difference is that gzcompress produces 6 bytes bigger result (2 extra bytes at the beginning and 4 extra bytes at the end).
romain dot lalaut at laposte dot net
08-Oct-2007 02:20
@ giunta dot gaetano at sea-aeroportimilano dot it
No, gzdeflate() implements rfc1951.
And rf2616 (http 1.1 specs) says "deflate : The "zlib" format defined in RFC 1950 [31] in combination with the "deflate" compression mechanism described in RFC 1951 [29]."
giunta dot gaetano at sea-aeroportimilano dot it
21-Aug-2006 12:22
Take care that that "PHP deflate" != "HTTP deflate".
The deflate encoding used in HTTP is actually zlib encoded.
This is what PHP functions return:
gzencode() == gzip
gzcompress() == zlib (aka. HTTP deflate)
gzdeflate() == *raw* deflate encoding
denis dot noessler at red-at dot de
17-Jun-2003 10:26
if you have compressed data which is greater than 2 MB (system dependent), you will receive a buffer error by calling the function gzinflate().
be sure to to compress your data by a lower compression level, like 1.
i.e.: gzdeflate($sData, 1);