在平时的网站建设中，有时会因为活动的需要，让达到一定要求的客户可以在线随机抽奖，之前网络上有介绍关于jquery来实现的方法，今天绵阳动力网络公司为你介绍用PHP实现随机抽奖抽奖的思路及实现代码：

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

运行结果：