Change merge css name generated

Question

In order to refresh my client browser with the last styles, I want to change the name of the generated files when I merge them.

What... where that name is generated?

I merge the css with System > Configuration > Developer > Css Settings > Merge CSS Files to Yes.

It generate a css like 9128734598173458912.css, but it's always the same name, and I want to change it each time I merge the css even the content doesn't change.

UPDATE

@xMageStore give me a good clue, but I think my solution is

Mage/Code/Model/Design/Package.php public function getMergedCssUrl($files){...}

Maybe @xMageStore solution is better to add a variable after each file, like styles.css?version=1.1 It's a good way to refresh the client browser

I need to check more to find what's the best solution

Answer 1

Finally I rewrite getMergedCssUrl method in Mage_Core_Model_Design_Package, to automatically generate new name each time the css change I used:

 // merge into target file
        $olderTimestamp = '';
        foreach ($files as $file) {
            if ($olderTimestamp < filemtime($file)) {
                $olderTimestamp = filemtime($file);
            }
        }
        $targetFilename = md5(implode(',', $files) . "|{$hostname}|{$port}|{$olderTimestamp}") . '.css';

But special metion to @xMageStore, because I think your answer can be usefull if the css or Js isn't merged.

Answer 2

@oootramas answer is very elegant, but I think it could be even further improved upon. Just do

$timestampString = '';
 foreach ($files as $file) {
     $timestampString .= filemtime($file);
 }
 $targetFilename = md5(implode(',', $files) . "|{$hostname}|{$port}|{$timestampString}") . '.css';

Above code will take into account the filemtime of every CSS file, instead of the filemtime of just the oldest file.

That way you get a different hash if you edit a newer CSS file, too.

Answer 3

There is way to change name of merge css/js files. You can see Mage_Page_Block_Html_Head file and function name is getCssJsHtml() Hope it will help you!