When posting code, please use the forum markup tags described in the FAQs to mark up your code for readability.
As the result of the var_dump indicates, [font=monospace]$_REQUEST['data'][/font] is an [man]array[/man], and works as such. (For a start, it has ten elements, with indices like [font=monospace]wyovaf7y-xpn1pb3h00br05dwbwvyfb7muhi[/font]).