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Editorial Team
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Asked: 2026-05-13T11:12:10+00:00

I have a unique problem, which is proving difficult to solve using google. I

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I have a unique problem, which is proving difficult to solve using google. I am consolidating all of my javascript and css into separate php files, which use require_once() to pull the contents of the files in. The javascript file looks something like this:

<?php
header('Content-Type: text/javascript');
require_once('jquery.form.js');
require_once('jquery.jqtransform.js');
require_once('jquery.validate.js');
?>

My specific problem is that web browsers will ‘see’ that this is a dynamic page, because of the php file extension, and then request the content anew each time a page on the site is loaded. What I am trying to do is get the time of last request from the browser, and then check each file modification time to see if I really do need to send the file contents again. It is proving difficult to find the time of last request by the user. Also, I have not yet started to tackle the problem of finding the last modified date of the files that are included, so if there is information regarding finding the file details of a file on the server, that would also be appreciated.

Just to be clear, the reason I am doing this is because (I think) it takes advantage of the gzip compression better than individually gzipped files.

Thanks in advance

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1 Answer

  1. Editorial Team

    Your premise is incorrect. Browsers don’t “see” the PHP file extension and decide not to cache things. See http://www.enhanceie.com/redir/?id=httpperf for information on how browsers really work.

    You should set an ETAG on your response, and then you can simply check the If-None-Match request header and return a 304 if the content is unchanged.

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