Changed normal link to special :phpfunction: link

wouterj · wouterj · commit 279302cfacec · 2012-11-24T19:17:01.000+01:00
diff --git a/reference/constraints/Max.rst b/reference/constraints/Max.rst
@@ -69,6 +69,4 @@ invalidMessage
 **type**: ``string`` **default**: ``This value should be a valid number``
 
 The message that will be shown if the underlying value is not a number (per
-the `is_numeric`_ PHP function).
-
-.. _`is_numeric`: http://www.php.net/manual/en/function.is-numeric.php
+the :phpfunction:`is_numeric` PHP function).
