$data = [];      for($i=0; $i<10; $i++) {        $data[] = $i;      }      print_r($data);

Array(    [0] => 0    [1] => 1    [2] => 2    [3] => 3    [4] => 4    [5] => 5    [6] => 6    [7] => 7    [8] => 8    [9] => 9)