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.


@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

  • Magento 1.9 doesn't have a dedicated way that you can merge styles built into the framework, can you explain your set up in more detail? are you using a css pre-processor like sass or less? What theme are you using? Is it a custom theme, one of the built in themes or something that has been purchased?
    – circlesix
    May 17 '18 at 13:09
  • If you clear the CSS/JS Cache, the files will have an update to the Last Modified Header Which will force browsers to re-download them & I think that accomplishes your goal.
    – mtr.web
    May 17 '18 at 13:19
  • 1
    @circlesix - I think the OP is referring to the config setting to Merge CSS Files..
    – mtr.web
    May 17 '18 at 13:19
  • Good call, think you're right.
    – circlesix
    May 17 '18 at 15:16

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.


@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.


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!

  • Good point, but I'm not sure it's what I'm looking for... not sure, yet
    – ooootramas
    May 17 '18 at 14:04
  • This function is used for naming the merged css/js so you can add the custom name here for the css/js.
    – xMageStore
    May 18 '18 at 5:01

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