Add Exception if MB support is not available in PHP

git-svn-id: https://svn.fournier38.fr/svn/ProgSVN/trunk@3813 bf3deb0d-5f1a-0410-827f-c0cc1f45334c

convert.php

@@ -53,6 +53,9 @@ class convert
     */
   public static function ucfirst ($str)
   {
+    if (! function_exists ("mb_strtoupper"))
+      throw new \Exception ("PHP don't have the MB Support. Please add it !",
+        500);
     $a = mb_strtoupper (mb_substr ($str, 0, 1, 'UTF-8'), 'UTF-8');
     return $a . mb_substr ($str, 1, null, 'UTF-8');
   }
@@ -68,6 +71,9 @@ class convert
     */
   public static function ucwords ($str, $delimiters = " \t\r\n\f\v")
   {
+    if (! function_exists ("mb_strtolower"))
+      throw new \Exception ("PHP don't have the MB Support. Please add it !",
+        500);
     $str = mb_strtolower ($str, "utf-8");
     $res = "";
     foreach  (preg_split ("#([".preg_quote ($delimiters)."]+)#", $str, -1,