$prize = array(
1 => 3.5, //3.5%機率
2 => 2.5, 
3 => 6, 
4 => 2, 
5 => 42, //42%機率
6 => 36, 
7 => 2, 
8 => 4, 
9 => 2
);
//最后確認相加等于100
$prizeList = array(
1 => array('小仙子'), 
2 => array('5Q幣'), 
3 => array('38888游戲幣'), 
4 => array('88888游戲幣'), 
5 => array('謝謝參與!'), 
6 => array('歡迎下次再來！'), 
7 => array('10Q幣'), 
8 => array('888銀元寶（綁定）'), 
9 => array('隨機高級坐騎（綁定）')
);
//unset($prize[7]); 直接把10Q這個獎品去掉
$times = 10;
$max = 0;
foreach ($prize as $k => $v)
{
$max = $v * $times + $max;
$row['v'] = $max;
$row['k'] = $k;
$prizeZone[] = $row;
}
$max--; //臨界值
$rand = mt_rand(0, $max);
$zone = 1;
foreach ($prizeZone as $k => $v)
{
if ($rand >= $v['v'])
{
if ($rand >= $prizeZone[$k + 1]['v'])
{
continue;
}
else
{
$zone = $prizeZone[$k + 1]['k'];
break;
}
}
$zone = $v['k'];
break;
}
print_r($prizeList[$zone][0]);