Get data in type from DB

+-------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| term | varchar(255) | NO | | NULL | |
| level | int(11) | NO | | NULL | |
+-------+--------------+------+-----+---------+----------------+


Result

array(4) {
[0]=>
array(3) {
["id"]=>
string(1) "1"
["term"]=>
string(11) "Mesoamerica"
["level"]=>
string(1) "1"
}
[1]=>
array(3) {
["id"]=>
string(1) "2"
["term"]=>
string(6) "Mexico"
["level"]=>
string(1) "1"
}
[2]=>
array(3) {
["id"]=>
string(1) "3"
["term"]=>
string(10) "indigenous"
["level"]=>
string(1) "2"
}
[3]=>
array(3) {
["id"]=>
string(1) "4"
["term"]=>
string(5) "ruins"
["level"]=>
string(1) "2"
}
}

but i need ID if integer instead