Sharing examples of how to implement algorithm for calculating lottery probability in PHP

This article mainly introduces PHP programming to implement the calculation of lottery probability algorithm, and analyzes the operation skills related to PHP random number operation in the form of complete examples. Friends in need can refer to it

The examples in this article describe the implementation of PHP programming Algorithm for calculating lottery probability. Share it with everyone for your reference, the details are as follows:

<?php
  //计算抽奖的概率
  function get_rand($proArr) {
    $result = &#39;&#39;;
    $proSum = array_sum($proArr);
    foreach ($proArr as $key => $proCur) {
      $randNum = mt_rand(1, $proSum);
      if ($randNum <= $proCur) {
        $result = $key;
        break;
      } else {
        $proSum -= $proCur;
      }
    }
    unset ($proArr);
    return $result;
  }
  $prize_arr = array(
    &#39;0&#39; => array(&#39;id&#39;=>1,&#39;prize&#39;=>&#39;家电&#39;,&#39;v&#39;=>2),
    &#39;1&#39; => array(&#39;id&#39;=>2,&#39;prize&#39;=>&#39;数码相机&#39;,&#39;v&#39;=>5),
    &#39;2&#39; => array(&#39;id&#39;=>3,&#39;prize&#39;=>&#39;iPad&#39;,&#39;v&#39;=>13),
    &#39;3&#39; => array(&#39;id&#39;=>4,&#39;prize&#39;=>&#39;LED显示器&#39;,&#39;v&#39;=>15),
    &#39;4&#39; => array(&#39;id&#39;=>5,&#39;prize&#39;=>&#39;U盘&#39;,&#39;v&#39;=>25),
    &#39;5&#39; => array(&#39;id&#39;=>6,&#39;prize&#39;=>&#39;键盘&#39;,&#39;v&#39;=>30),
    &#39;6&#39; => array(&#39;id&#39;=>7,&#39;prize&#39;=>&#39;鼠标垫&#39;,&#39;v&#39;=>10),
  );
  foreach ($prize_arr as $key => $val) {
    $arr[$val[&#39;id&#39;]] = $val[&#39;v&#39;];
  }
  $rid = get_rand($arr);
  $res[&#39;yes&#39;] = $prize_arr[$rid-1][&#39;prize&#39;];
  unset($prize_arr[$rid-1]);
  shuffle($prize_arr);
  $prize_arrcount = count($prize_arr);
  for($i=0;$i<$prize_arrcount;$i++){
    $pr[] = $prize_arr[$i][&#39;prize&#39;];
  }
  $res[&#39;no&#39;] = $pr;
  //抽奖结果
  $ro = $res[&#39;yes&#39;];
  print_r($ro);
?>

Running results:

iPad

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