CSV-1 = "user,name,first,lala"
CSV-2 = "user,name,last,land"

array-1 = $a->b['user']['sub']['name']['sub']['first']
array-2 = $a->b['user']['sub']['name']['sub']['last']

Array = array(user=>'name',sub=>array(name=>array(sub=>array(first=>'lala',last=>'land'))))