$prize_arr = array( '0' => array('id'=>1,'prize'=>'平板电脑','v'=>3), '1' => array('id'=>2,'prize'=>'数码相机','v'=>5), '2' => array('id'=>3,'prize'=>'音箱设备','v'=>10), '3' => array('id'=>4,'prize'=>'4G优盘','v'=>12), '4' => array('id'=>5,'prize'=>'Q币10元','v'=>20), '5' => array('id'=>6,'prize'=>'下次没准就能中哦','v'=>50), ); foreach ($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($res); //计算概率 function getRand($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; }
通过设置概率，我们可以看出，砸中平板电脑的几率占3%，砸不中的几率占50%，点击演示demo来试试你的运气吧。
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