Update reference/constraints/MinLength.rst

wouterj · wouterj · commit 95f7d9022c87 · 2012-11-24T19:18:40.000+01:00
diff --git a/reference/constraints/MinLength.rst b/reference/constraints/MinLength.rst
@@ -80,8 +80,6 @@ charset
 
 **type**: ``charset`` **default**: ``UTF-8``
 
-If the PHP extension "mbstring" is installed, then the PHP function `mb_strlen`_
+If the PHP extension "mbstring" is installed, then the PHP function :phpfunction:`mb_strlen`
 will be used to calculate the length of the string. The value of the ``charset``
-option is passed as the second argument to that function.
-
-.. _`mb_strlen`: http://php.net/manual/en/function.mb-strlen.php
+option is passed as the second argument to that function.
