function transpose($array) {
array_unshift($array, null);
return call_user_func_array('array_map', $array);
}
$array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18];
var_dump(call_user_func_array('array_merge', transpose(array_chunk($array , 6))));
$arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18];
usort(
$arr,
function (int $a, int $b): int {
$result = (($a - 1) % 6) - (($b - 1) % 6);
return $result === 0 ? $a - $b : $result;
}
);
print_r($arr);
/* Array
(
[0] => 1
[1] => 7
[2] => 13
[3] => 2
[4] => 8
[5] => 14
[6] => 3
[7] => 9
[8] => 15
[9] => 4
[10] => 10
[11] => 16
[12] => 5
[13] => 11
[14] => 17
[15] => 6
[16] => 12
[17] => 18
) */
$cols_count = 7;
$rows_count = 3;
for($row=0;$row<$rows_count;$row++){
for($cols=0;$cols<$cols_count;$cols++){
$i = $cols + $row*$cols_count;
echo $array[$i];
}
}
