PHP implements the big wheel lottery algorithm (code example)

function get_gift(){ //拼装奖项数组 // 奖项id，奖品，概率 $prize_arr = array( '0' => array('id'=>1,'prize'=>'平板电脑','v'=>0), '1' => array('id'=>2,'prize'=>'数码相机','v'=>0), '2' => array('id'=>3,'prize'=>'音箱设备','v'=>0), '3' => array('id'=>4,'prize'=>'4G优盘','v'=>5), '4' => array('id'=>5,'prize'=>'10Q币','v'=>0), '5' => array('id'=>6,'prize'=>'空奖','v'=>5), ); foreach ($prize_arr as $key => $val) { $arr[$val['id']] = $val['v'];//概率数组 } $rid = $this->get_rand($arr); //根据概率获取奖项id $res['yes'] = $prize_arr[$rid-1]['prize']; //中奖项 unset($prize_arr[$rid-1]); //将中奖项从数组中剔除，剩下未中奖项 shuffle($prize_arr); //打乱数组顺序 for($i=0;$i $proCur) { $randNum = mt_rand(1, $proSum); //返回随机整数 if ($randNum <= $proCur) { $result = $key; break; } else { $proSum -= $proCur; } } unset ($proArr); return $result; }