swift_performance_css_filename
Filter for the filename of merged CSS.
Parameters
$filename
string, contains the filename of the CSS file (without path, with the extension, eg: ff1ccf57e98c817df1efcd9fe44a8aeb.css)
$key:
media attribute for the CSS all if CSS doesn’t have any media attribute, otherwise the attribute string (eg: print, or min-width:768px)
Return
string
Example
// shorten CSS filename
add_filter('swift_performance_css_filename', function($filename, $key){
return substr($filename, 0, 15);
}, 10, 2);