public static function url($files) { $ident = self::ident($files); if (!\SYSTEM\CACHE\cache_css::get($ident)) { \LIB\lib_minify::php(); $minifier = new \MatthiasMullie\Minify\CSS(); foreach ($files as $f) { $minifier->add($f->SERVERPATH()); } \SYSTEM\CACHE\cache_css::put($ident, $minifier->minify()); } return './api.php?call=cache&id=' . self::CACHE_CSS . '&ident=' . $ident; }