+ function theme_valid($file) {
+ if ($file == "default.css") return true; // needed for array_filter
+ $file = "themes/" . basename($file);
+
+ if (file_exists($file) && is_readable($file)) {
+ $fh = fopen($file, "r");
+
+ if ($fh) {
+ $header = fgets($fh);
+ fclose($fh);
+
+ return strpos($header, "supports-version:" . VERSION_STATIC) !== FALSE;
+ }
+ }
+
+ return false;
+ }