When to use gzip

Allowee · #1 22-Jun-2003, 08:38

I got this script from a site somewhere....

this is just the header..

PHP Code:


//// gzip_compression//$do_gzip_compress = FALSE;if ( $gzip_compress ){    $phpver = phpversion();    $useragent = (isset($_SERVER["HTTP_USER_AGENT"]) ) ? $_SERVER["HTTP_USER_AGENT"] : $HTTP_USER_AGENT;   if ( $phpver >= '4.0.4pl1' AND ( strstr($useragent,'compatible') OR strstr($useragent,'Gecko') ) ){     if ( extension_loaded('zlib') ){            ob_start('ob_gzhandler');        }   }else if ( $phpver > '4.0' AND ( strstr($useragent,'compatible') OR strstr($useragent,'Gecko') )){     $accept_encoding = (isset($_SERVER["HTTP_ACCEPT_ENCODING"]) ) ? $_SERVER["HTTP_ACCEPT_ENCODING"] : $HTTP_ACCEPT_ENCODING;        if ( strstr($accept_encoding, 'gzip') ){            if ( extension_loaded('zlib') ){                $do_gzip_compress = TRUE;                ob_start();                ob_implicit_flush(0);                header('Content-Encoding: gzip');            }        }    }}

But, do i need to check the browser?
your gzip test script doesn't work when i put http://69.49.231.162/index.php in it.
but when you look at the headers from a normal browser it does work.

is checking for the accept_encoding enough?

JdS · #2 22-Jun-2003, 08:57

If the gzip test says that the web page is not gzipped, chances are that it is not.

I only know of one bug so far (with gziptest) and that was something that was to do with the percentage calculations for 'special' web pages.

I don't know much about these pre-PHP version 4.0.6 hacks for compressing your web pages, but with .htaccess php_flag and ob_start('ob_gzhandler') methods, the script will send compressed or non-compressed output to a browser automatically - otherwise I would have had a serious mess with all the search-engine bots by now.

Allowee · #3 22-Jun-2003, 09:57

I'll remove the browser checks and also the php version checks...

i'll add 1 check for the version... just i case.

btw, do you know what i think about your script when i saw
http://Leknor.com/code/gziped.php in my log?

I think your version looks nicer

JdS · #4 22-Jun-2003, 10:15

That was ME

I used the script at leknor to verify results from gziptest.

... and about my script looking better - it's only normal since mine is newer. Wait till you see his next upgrade...

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