Gzip and Cache PHP Code

Question

Here is my PHP Code

$phpver = phpversion(); $useragent = (isset($_SERVER["HTTP_USER_AGENT"]) ) ? $_SERVER["HTTP_USER_AGENT"] : $HTTP_USER_AGENT; $do_gzip_compress = FALSE; if ($phpver >= '4.0.4pl1' && (strstr($useragent,'compatible') || strstr($useragent,'Gecko'))) { if (extension_loaded('zlib')) { ob_start('ob_gzhandler'); } } header('Content-type: text/javascript;charset=utf-8'); header('Expires: '.gmdate("D, d M Y H:i:s", time() + 3600*24*365).' GMT'); echo "TEST";

I basically want to cache the content (on client side) forever as well as gzip it. However I am not sure if the above is the best way. I do not want to use any third party scripts. Is my client side caching headers enough? Do I need to add more? Also, will this interfere with Apache's native gzipping (which is turned on the server)- will it gzip twice?

Thank you for your time.

It should be cross-browser, I believe sometimes a blank page appears in some browsers due to gzip. — Alec Smart
– Alec Smart, Commented Oct 5, 2009 at 14:17
It's just not worth the extra work to manually GZip the code; if the version is older than 4.0.4 then a host needs to upgrade for their own benefit, let alone yours. — Robert K
– Robert K, Commented Oct 5, 2009 at 14:30
Many hosts do not have mod_deflate etc. installed on their servers by default, which is why I am trying to gzip. — Alec Smart
– Alec Smart, Commented Oct 5, 2009 at 14:32

Justin Alexander · Accepted Answer · 2009-10-14 12:57:13Z

ob_gzhandler will automatically detect if the users browser is gz compatible.

It will also automatically modify your headers.

It won't detect if apache is running mod_deflate or mod_gzip (and who says your using Apache anyway!)

if(!ob_start("ob_gzhandler")) ob_start(); /* insert code here then flush the buffer to $buffer */ $cacheTime = time(); // or the file date of your static file $gmt_mtime = gmdate('D, d M Y H:i:s', $cacheTime ) . ' GMT'; header("Content-type: text/css; charset=utf-8"); header("Last-Modified: " . $gmt_mtime ,true); header('Content-Length: ' . strlen($buffer),true); header("Expires: " . gmdate("D, d M Y H:i:s", $cacheTime + $seconds) . " GMT",true); header("Cache-Control: no-store, no-cache, must-revalidate, proxy-revalidate",true); header("Cache-Control: post-check=0, pre-check=0", FALSE); echo $buffer;

jlee · Accepted Answer · 2009-10-08 20:18:29Z

If you have root access, edit php.ini and add the following to automatically gzip your php pages.

zlib.output_compression = On zlib.output_compression_level = 1

then, your actual php page can be:

<?php $expires = 3600*24*365; header("Cache-Control: maxage=".$expires); header('Expires: ' . gmdate('D, d M Y H:i:s', time()+$expires) . ' GMT'); echo 'test'; ?>

Jay Paroline · Accepted Answer · 2009-10-12 02:23:11Z

It's not a big deal but ob_start('ob_gzhandler') will return false (and not turn on output buffering) if the client's browser does not support gzip encoding, so you can eliminate the user agent tests.

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