mb_convert_encoding(): Illegal character encoding specified #40 fixed

Author: Webklex

src/IMAP/Message.php

@@ -502,10 +502,14 @@ private function decodeString($string, $encoding) {
      * @return mixed|string
      */
     private function convertEncoding($str, $from = "ISO-8859-2", $to = "UTF-8") {
-        if (!$from) {
-            return mb_convert_encoding($str, $to);
+        if (function_exists('iconv') && $from!='UTF-7' && $to!='UTF-7') {
+            return iconv($from, $to, $str);
+        } else {
+            if (! $from) {
+                return mb_convert_encoding($str, $to);
+            }
+            return mb_convert_encoding($str, $to, $from);
         }
-        return mb_convert_encoding($str, $to, $from);
     }
 
     /**