洗牌算法

<?php
$card_num = 54;//牌数
function wash_card($card_num){
    $cards = $tmp = array();
    for($i = 0;$i < $card_num;$i++){
        $tmp[$i] = $i;
    }
    
    for($i = 0;$i < $card_num;$i++){
        $index = rand(0,$card_num-$i-1);
        $cards[$i] = $tmp[$index];
        unset($tmp[$index]);      //删掉临时的
        $tmp = array_values($tmp);//重新排序
    }
    return $cards;
}

var_dump(wash_card($card_num));