PHP autocomplete excessively agressive

Editing the number in an arrays index causes autocomplete to pop open with a list of all variables/classes/methods. Is there any way to completely disable the autcomplete popup when typing in numbers?

For example:
$aResult[2][ $f ][1][] = $i;

Clicking on the "1" and typing "2" causes autocomplete to trigger a full list of variables/methods within the project. None of which have a "2" in them.

Thanks.