Description:
------------
I am not sure already what is it related to, but it's getting interesting :)
The engine does not recognise the class that implements the ArrayAccess interface as declared in the code written before the class declaration is placed.

Reproduce code:
---------------
<?php
var_dump(class_exists('validatorCheck'));

class validatorCheck implements ArrayAccess {

function offsetGet($key){}
function offsetSet($key, $value) {}
function offsetUnset($key) {}
function offsetExists($offset) {}

//class end
}

var_dump(class_exists('validatorCheck'));
?>

Expected result:
----------------
bool(true)
bool(true)

Actual result:
--------------
bool(false)
bool(true)