Don't use old style constructor in example

Closes GH-1406.

Author: cmb69

reference/array/functions/usort.xml

@@ -163,7 +163,7 @@ $fruits[2]: lemons
 class TestObj {
     var $name;
 
-    function TestObj($name)
+    function __construct($name)
     {
         $this->name = $name;
     }