Merge branch 'failed-arrayaccess-test' into PHP-5.3

* failed-arrayaccess-test:
  Added failing test for ArrayObject::offsetExists().

Author: Shein Alexey

ext/spl/tests/arrayObject_offsetExists_nullcheck.phpt

@@ -0,0 +1,10 @@
+--TEST--
+SPL: ArrayObject::offsetExists() should return true for element containing NULL
+--FILE--
+<?php
+$ao = new ArrayObject(array('foo' => null));
+var_dump($ao->offsetExists('foo'));
+
+?>
+--EXPECTF--
+bool(true)