edit

src/Api.php

@@ -124,7 +124,10 @@ class Api
     public function string($area, $im = ',', $unset = true, $name = '不限')
     {
         if ($area) {
-            $area = explode(',', $area);
+            if (is_string($area)) {
+                $area = explode(',', $area);
+            }
+            
             $result = array();
             foreach ($area as $k => $v) {
                 if ($k == 0) {