1 $prizes = array(
 2         0 => array(
 3             "id" => 0, //中奖id
 4             "name" => "谢谢参与", //奖品名称
 5             "count" => "100", //库存
 6         ),
 7         1 => array(
 8             "id" => 1,
 9             "name" => "罗浮山门票",
10             "count" => "40",
11         ),
12         2 => array(
13             "id" => 2,
14             "name" => "罗浮山嘉宝田温泉体验券",
15             "count" => "40",
16         ),
17         3 => array(
18             "id" => 3,
19             "name" => "精美旅游书籍《山水酿惠州》",
20             "count" => "40",
21         ),
22         4 => array(
23             "id" => 4,
24             "name" => "碧海湾漂流门票",
25             "count" => "40",
26         ),
27         5 => array(
28             "id" => 5,
29             "name" => "南昆山门票",
30             "count" => "40",
31         ),
32         6 => array(
33             "id" => 6,
34             "name" => "云顶温泉精美礼品",
35             "count" => "40",
36         ),
37     );

 1 function getRand($proArr, $proCount) {
 2     $result = '';
 3     $proSum = 0;
 4     foreach ($proCount as $key => $val) {
 5         if ($val <= 0) {
 6             continue;
 7         } else {
 8             $proSum = $proSum + $proArr[$key];
 9         }
10     }
11     foreach ($proArr as $key => $proCur) {
12         if ($proCount[$key] <= 0) {
13             continue;
14         } else {
15             $randNum = mt_rand(1, $proSum);
16             if ($randNum <= $proCur) {
17                 $result = $key;
18                 break;
19             } else {
20                 $proSum -= $proCur;
21             }
22         }
23     }
24     unset($proArr);
25     return $result;
26 }