combine($value, $array)
$value: value to be combined
$array: array to which value is combined
$array = [1];
combine(2, $array);
vdump($array); //[1, 2]
$array = [1];
combine([2, 3], $array);
vdump($array); //[1, 2, 3]
$array = [1, 2];
combine([2, 3], $array);
vdump($array); //[1, 2, 2, 3]