array(5372) {
[0]=>
array(1) {
["id"]=>
string(4) "1338"
}
[1]=>
array(1) {
["id"]=>
string(4) "3727"
}
[2]=>
array(1) {
["id"]=>
string(4) "3849"
}
[0] => 1338
[1] => 3727
[2] => 3849
$input = array(
array(
"id" => "1338",
),
array(
"id" => "3727",
),
array(
"id" => "3849",
)
);
var_dump(array_map('intval', array_column($input, 'id')));