/**
* Modify to start of current minute, seconds become 0
*
* @example
* ```
* echo Carbon::parse('2018-07-25 12:45:16')->startOfMinute();
* ```
*
* @return static
*/
public function startOfMinute()
{
return $this->setTime($this->hour, $this->minute, 0, 0);
}var arr1 = [1, 2, [3, 4]];
arr1.flat();
// [1, 2, 3, 4]
var arr2 = [1, 2, [3, 4, [5, 6]]];
arr2.flat();
// [1, 2, 3, 4, [5, 6]]
var arr3 = [1, 2, [3, 4, [5, 6]]];
arr3.flat(2);
// [1, 2, 3, 4, 5, 6]