PHP内置函数实现简单洗牌

function wash_card($num_card)
{
  $a = array_keys(array_fill(0, $num_card, ''));
  $b = array_keys(array_fill(1, $num_card, ''));
  $card_data = array_combine($a, $b);
  shuffle($card_data);
  return $card_data;
}

function card_wash($card_num)
{
  $card_data = range(1, $card_num);
  shuffle($card_data);
  return $card_data;
}