Fix rcube_utils::explode_quoted_string() with explode(), added tests

1 files changed, 1 insertions, 1 deletions

diff --git a/program/include/rcube_utils.php b/program/include/rcube_utils.php
index 2a4d4c482..5cfd8e70e 100644
--- a/program/include/rcube_utils.php
+++ b/program/include/rcube_utils.php
@@ -761,7 +761,7 @@ class rcube_utils
             }
         }
 
-        $result[] = substr($string, $p);
+        $result[] = (string) substr($string, $p);
 
         return $result;
     }