It’s weird that I swear David Walsh follows me around – everytime I have a conversation with someone about something, he writes an article about it – like preventing your css and javascript from being cached.
I had come to the same conclusion (from by conversation with Toby) that random querystrings being appended didn’t make much sense – that prevents caching, but why stop caching – unless the file gets updated?
I wrote a little php function that works with filemtime, albeit it requires the absolute path of the file.
[code lang="php"]
function autoVer($url){
$path = pathinfo($url);
$ver = '.'.filemtime($_SERVER['DOCUMENT_ROOT'].$url);
echo $path['dirname'].'/'.$path['basename'].'?'.$ver;
}
[/code]
What this means, is when we call our files like so:
[code lang="php"]
[/code]
It renders like so:
[code lang="php"]
[/code]
So only when your file gets updated, does the query update, forcing the cache invalid!
It’s a simple function – and by no means perfect. Would you refactor it, or do you have a better way?
