function get_rand($proArr) {   $result = '';   //概率數(shù)組的總概率精度   $proSum = array_sum($proArr);     //概率數(shù)組循環(huán)   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(shù)碼相機(jī)','v'=>5),   '2' => array('id'=>3,'prize'=>'音箱設(shè)備','v'=>10),   '3' => array('id'=>4,'prize'=>'4G優(yōu)盤','v'=>12),   '4' => array('id'=>5,'prize'=>'10Q幣','v'=>22),   '5' => array('id'=>6,'prize'=>'下次沒(méi)準(zhǔn)就能中哦','v'=>50), );

foreach ($prize_arr as $key => $val) {   $arr[$val['id']] = $val['v']; }  $rid = get_rand($arr); //根據(jù)概率獲取獎(jiǎng)項(xiàng)id  $res['yes'] = $prize_arr[$rid-1]['prize']; //中獎(jiǎng)項(xiàng) unset($prize_arr[$rid-1]); //將中獎(jiǎng)項(xiàng)從數(shù)組中剔除，剩下未中獎(jiǎng)項(xiàng) shuffle($prize_arr); //打亂數(shù)組順序 for($i=0;$i<count($prize_arr);$i++){   $pr[] = $prize_arr[$i]['prize']; } $res['no'] = $pr; echo json_encode($res);