public function testTransform()
{
$input = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
$this->assertSame(Data::transform($input), [[1, 4, 7], [2, 5, 8], [3, 6, 9]]);
}
private function column($rows)
{
$cols = Data::transform($rows);
$lens = array_map(function ($col) {
return max(array_map('strlen', $col));
}, $cols);
return array_map(function ($row) use($lens) {
return implode("\t", array_map('str_pad', $row, $lens));
}, $rows);
}
