array('id'=>1,'prize'=>'平板电脑','v'=>3),     '1' => array('id'=>2,'prize'=>'数码相机','v'=>5),     '2' => array('id'=>3,'prize'=>'音箱设备','v'=>10),     '3' => array('id'=>4,'prize'=>'4G优盘','v'=>12),     '4' => array('id'=>5,'prize'=>'Q币10元','v'=>20),     '5' => array('id'=>6,'prize'=>'下次没准就能中哦','v'=>50), );  foreach ($prize_arr as $key => $val) {     $arr[$val['id']] = $val['v']; }  $rid = getRand($arr); //根据概率获取奖项id $res['msg'] = ($rid==6)?0:1; //如果为0则没中 $res['prize'] = $prize_arr[$rid-1]['prize']; //中奖项 //echo json_encode($res); //var_dump($res); //计算概率 function getRand($proArr) {     $result = '';      //概率数组的总概率精度     $proSum = array_sum($proArr);      //概率数组循环     foreach ($proArr as $key => $proCur) {         $randNum = mt_rand(1, $proSum);         if ($randNum <= $proCur) {             $result = $key;             break;         } else {             $proSum -= $proCur;         }     }     unset ($proArr);      return $result; } ?>