PHP에서 복권 확률 알고리즘 기능을 구현하기 위한 아이디어 분석

<?php
include_once "codecj.php";//引入类文件

//定义数组
$prize_arr = array(
  &#39;0&#39; => array(&#39;id&#39;=>1,&#39;prize&#39;=>&#39;平板电脑&#39;,&#39;v&#39;=>1),
  &#39;1&#39; => array(&#39;id&#39;=>2,&#39;prize&#39;=>&#39;数码相机&#39;,&#39;v&#39;=>5),
  &#39;2&#39; => array(&#39;id&#39;=>3,&#39;prize&#39;=>&#39;音箱设备&#39;,&#39;v&#39;=>10),
  &#39;3&#39; => array(&#39;id&#39;=>4,&#39;prize&#39;=>&#39;4G优盘&#39;,&#39;v&#39;=>12),
  &#39;4&#39; => array(&#39;id&#39;=>5,&#39;prize&#39;=>&#39;10Q币&#39;,&#39;v&#39;=>22),
  &#39;5&#39; => array(&#39;id&#39;=>6,&#39;prize&#39;=>&#39;下次没准就能中哦&#39;,&#39;v&#39;=>50),
);
 
 //每次前端页面的请求，PHP循环奖项设置数组，
 foreach ($prize_arr as $key => $val) {
    $arr[$val[&#39;id&#39;]] = $val[&#39;v&#39;];
}
$rid = get_rand($arr); //根据概率获取奖项id

$res[&#39;yes&#39;] = $prize_arr[$rid-1][&#39;prize&#39;]; //中奖项
unset($prize_arr[$rid-1]); //将中奖项从数组中剔除，剩下未中奖项
shuffle($prize_arr); //打乱数组顺序
for($i=0;$i<count($prize_arr);$i++){
    $pr[] = $prize_arr[$i][&#39;prize&#39;];
}
$res[&#39;no&#39;] = $pr;
print_r($res);
?>