gzdecode
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.
gzdeflate
(PHP 4 >= 4.0.4, PHP 5)
gzdeflate — کاهش رشته
Description
string gzdeflate
( string $data
[, int $level = -1
] )
این تابع رشته را با استفاده از قالب داده DEFLATE فشرده میکند.
برای جزئیات الگوریتم فشردهسازی DEFLATE مستندات "» مشخصات قالب داده فشرده DEFLATE نسخه 1.3" (RFC 1951) را ببینید.
Parameters
- data
-
داده برای کاهش.
- level
-
سطح فشردهسازی. میتواند 0 برای عدم فشردهسازی تا 9 برای بیشترین فشردهسازی باشد. اگر داده نشود سطح پیشفرض فشردهسازی همان سطح فشردهسازی پیشفرض کتابخانه zlib خواهد بود.
Return Values
رشته کاهش یافته یا FALSE در صورت خطا.
Examples
Example #1 مثال gzdeflate()
<?php
$compressed = gzdeflate('Compress me', 9);
echo $compressed;
?>
See Also
- gzinflate() - کاهش دادن string
- gzcompress() - فشرده کردن رشته
- gzuncompress() - غیرفشردهسازی رشته فشرده شده
- gzencode() - ساخت رشته فشرده gzip
add a note
User Contributed Notes
gzdeflate - [6 notes]
anonymous at php dot net ¶
3 years ago
robin ¶
3 years ago
running 50000 repetitions on various content, i found that gzdeflate() and gzcompress() both performed equally fast regardless content and compression level, but gzinflate() was always about twice as fast as gzuncompress().
tomas at slax dot org ¶
4 years ago
gzcompress() is the same like gzdefflate(), it produces identical data and its speed is the same as well. The only difference is that gzcompress produces 6 bytes bigger result (2 extra bytes at the beginning and 4 extra bytes at the end).
giunta dot gaetano at sea-aeroportimilano dot it ¶
6 years ago
Take care that that "PHP deflate" != "HTTP deflate".
The deflate encoding used in HTTP is actually zlib encoded.
This is what PHP functions return:
gzencode() == gzip
gzcompress() == zlib (aka. HTTP deflate)
gzdeflate() == *raw* deflate encoding
denis dot noessler at red-at dot de ¶
9 years ago
if you have compressed data which is greater than 2 MB (system dependent), you will receive a buffer error by calling the function gzinflate().
be sure to to compress your data by a lower compression level, like 1.
i.e.: gzdeflate($sData, 1);
romain dot lalaut at laposte dot net ¶
5 years ago
@ 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]."