function get_gift(){     //拼裝獎項數組     // 獎項id，獎品，概率    $prize_arr = array(       '0' => array('id'=>1,'prize'=>'平板電腦','v'=>0),       '1' => array('id'=>2,'prize'=>'數碼相機','v'=>0),       '2' => array('id'=>3,'prize'=>'音箱設備','v'=>0),       '3' => array('id'=>4,'prize'=>'4G優盤','v'=>5),       '4' => array('id'=>5,'prize'=>'10Q幣','v'=>0),       '5' => array('id'=>6,'prize'=>'空獎','v'=>5),      );      foreach ($prize_arr as $key => $val) {       $arr[$val['id']] = $val['v'];//概率數組      }      $rid = $this->get_rand($arr); //根據概率獲取獎項id      $res['yes'] = $prize_arr[$rid-1]['prize']; //中獎項      unset($prize_arr[$rid-1]); //將中獎項從數組中剔除，剩下未中獎項      shuffle($prize_arr); //打亂數組順序      for($i=0;$i<count($prize_arr);$i++){       $pr[] = $prize_arr[$i]['prize']; //未中獎項數組     }      $res['no'] = $pr;     // var_dump($res);         if($res['yes']!='空獎'){       $result['status']=1;       $result['name']=$res['yes'];     }else{       $result['status']=-1;       $result['msg']=$res['yes'];     }      //return $result;     var_dump($result);  }   //計算中獎概率  function get_rand($proArr) {     $result = '';     //概率數組的總概率精度     $proSum = array_sum($proArr);     // var_dump($proSum);   //概率數組循環     foreach ($proArr as $key => $proCur) {      $randNum = mt_rand(1, $proSum); //返回隨機整數     if ($randNum <= $proCur) {       $result = $key;       break;      } else {       $proSum -= $proCur;      }     }     unset ($proArr);     return $result;    }