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  1. #1
    Senior Member medlington's Avatar
    Join Date
    Nov 2005
    Location
    Sheffield, UK
    Posts
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    11968
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    Hi,

    I've just run Yslow on one of my sites and its telling me to set expires headers so that certain elements of the page get cached.

    I've had a quick search for how to do this but cant find a clear answer anywhere.

    Is this something I set in the meta tags at the top or is it attached to each relevant element or is it set in .htaccess?

    Can anyone explain how to do this?

    Thanks

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  3. #2
    WDF Staff smoseley's Avatar
    Join Date
    Mar 2003
    Location
    Boston, MA
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    The best way to auto-cache content on a php site is to use mod_expires (an Apache module), which you can set in your .htaccess file.

    If you do it in PHP, you want to do it at the HTTP header level on the specific page you're caching.

    For that, you'll do something like:
    PHP Code:
    <?php
    $expires 
    60*60*24*14// 2 week cache
    header("Pragma: public");
    header("Cache-Control: maxage=".$expires);
    header('Expires: ' gmdate('D, d M Y H:i:s'time()+$expires) . ' GMT');
    ?>
    Remember that you have to set your HTTP headers before outputting any other content, though, or you'll throw an exception.

    For more information, reference the PHP manual: http://php.net/manual/en/function.header.php


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