抽奖概率算法
$reward = array( 0=>array('id'=>0,'area'=>35,'prize'=>'金币5000'), 1=>array('id'=>1,'area'=>30,'prize'=>'蓝钻1天'), 2=>array('id'=>2,'area'=>15,'prize'=>'金币20000'), 3=>array('i...
$reward = array( 0=>array('id'=>0,'area'=>35,'prize'=>'金币5000'), 1=>array('id'=>1,'area'=>30,'prize'=>'蓝钻1天'), 2=>array('id'=>2,'area'=>15,'prize'=>'金币20000'), 3=>array('i...