1 files changed, 3 insertions, 3 deletions
diff --git a/libraries/mime.lib.php b/libraries/mime.lib.php
index 529a2d1d27..02b8242bd2 100644
--- a/libraries/mime.lib.php
+++ b/libraries/mime.lib.php
@@ -21,14 +21,14 @@ function PMA_detectMIME(&$test)
 {
     /** @var PMA_String $pmaString */
     $pmaString = $GLOBALS['PMA_String'];
-    $len = $pmaString->strlen($test);
+    $len = /*overload*/mb_strlen($test);
     if ($len >= 2 && $test[0] == chr(0xff) && $test[1] == chr(0xd8)) {
         return 'image/jpeg';
     }
-    if ($len >= 3 && $pmaString->substr($test, 0, 3) == 'GIF') {
+    if ($len >= 3 && /*overload*/mb_substr($test, 0, 3) == 'GIF') {
         return 'image/gif';
     }
-    if ($len >= 4 && $pmaString->substr($test, 0, 4) == "\x89PNG") {
+    if ($len >= 4 && /*overload*/mb_substr($test, 0, 4) == "\x89PNG") {
         return 'image/png';
     }
     return 'application/octet-stream';