Re: [dcphp-dev] Caching via "304 not modified" messages

Dug up some old code that does something similar, thought I'd add it to the collection:

if (php_sapi_name() == 'apache' OR php_sapi_name() == 'apache2handler') {
$ar = apache_request_headers();
// If-Modified-Since should exists
// not empty
// and grater than
if (isset($ar['If-Modified-Since']) AND $ar['If-Modified-Since'] != '' AND strtotime($ar['If-Modified-Since']) >= $row['imagetime']) {
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $row['imagetime']).' GMT', true, 304);
die();
}
}

-TG

----- Original Message -----
From: Oscar <oscar@oscarm.org>
To: Eric Maag <eric.maag@gmail.com>
Cc: DCPHP PHPDC <washington-dcphp-group@googlegroups.com>
Date: Tue, 23 Oct 2012 17:02:11 -0400
Subject: Re: [dcphp-dev] Caching via "304 not modified" messages

> Nice tip. Handy for those cases when you don't have enough static
> content to put a cache like varnish in front of your application. I'd
> get rid of the error suppresion in the IF statement:
>
> if ((isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE'])==$lastModified) || $etagHeader == $etagFile
> ) {
>
>
>
>
> In a similar vain, Zend Framework does some neat static caching using
> Apache rewrite rules.
> http://framework.zend.com/wiki/pages/viewpage.action?pageId=8947732
>
> On 10/23/2012 04:55 PM, Eric Maag wrote:
> > Awesome, I'd never thought of using Status Code Definitions to ease server load.
> >
> >
> > This clever bit of code checks if a page has been modified since it
> > was last displayed and if it hasn't, it sends a "304 not modified"
> > header and exits, otherwise the content is loads as normal. Add the
> > code below to the top of each PHP page you want to apply it to. It's
> > especially useful if you serve static content via php and want it to
> > be cached like ordinary HTML or CSS.
> >
> >
> > //get the last-modified-date of this very file
> > $lastModified=filemtime(__FILE__);
> > //get a hash of this file
> > $etagFile = md5_file(__FILE__);
> > //get the HTTP_IF_MODIFIED_SINCE header if set
> > $ifModifiedSince=(isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ?
> > $_SERVER['HTTP_IF_MODIFIED_SINCE'] : false);
> > //get the HTTP_IF_NONE_MATCH header if set
> > $etagHeader=(isset($_SERVER['HTTP_IF_NONE_MATCH']) ?
> > trim($_SERVER['HTTP_IF_NONE_MATCH']) : false);
> >
> > //set last-modified header
> > header("Last-Modified: ".gmdate("D, d M Y H:i:s", $lastModified)." GMT");
> > //set etag-header
> > header("ETag: \"$etagFile\"");
> > //make sure caching is turned on
> > header('Cache-Control: public');
> >
> > //check if page has changed If not send 304 header and exit
> > if (@strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE'])==$lastModified ||
> > $etagHeader == $etagFile)
> > {
> > header("HTTP/1.1 304 Not Modified");
> > exit;
> > }
> >
> > echo "Page last modified: ".date("d.m.Y H:i:s",time());
> >
> >
> > source:http://papermashup.com/php-clever-caching/
> >
>
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