function get_rand($proArr) {   $result = '';   //概率數組的總概率精度   $proSum = array_sum($proArr);     //概率數組循環   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'=>'平板電腦','v'=>1),   '1' => array('id'=>2,'prize'=>'數碼相機','v'=>5),   '2' => array('id'=>3,'prize'=>'音箱設備','v'=>10),   '3' => array('id'=>4,'prize'=>'4G優盤','v'=>12),   '4' => array('id'=>5,'prize'=>'10Q幣','v'=>22),   '5' => array('id'=>6,'prize'=>'下次沒準就能中哦','v'=>50), );

foreach ($prize_arr as $key => $val) {   $arr[$val['id']] = $val['v']; }  $rid = get_rand($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']; } $res['no'] = $pr; echo json_encode($res);