$array = [1, 2, 3, 4, 5, 6, 7, 8, 9];
$chunkSize = 3;
// Split the array into chunks
$chunks = array_chunk($array, $chunkSize);
print_r($chunks);
/*
run:
Array
(
[0] => Array
(
[0] => 1
[1] => 2
[2] => 3
)
[1] => Array
(
[0] => 4
[1] => 5
[2] => 6
)
[2] => Array
(
[0] => 7
[1] => 8
[2] => 9
)
)
*/