well.. you won't be able to do that cause what you're retrieving thru Ajax returns the text as html (it has a <pre> tag) and not as php code..
If you had php code with the array filled, then you could use this:
(assumin $arr is the main array)
PHP Code:
foreach ($arr as $arr2) {
$res=split(",",$arr2['images']);
$images[]=$res[0];
}
print_r($images);
Bookmarks