PHP+AJAX开发幸运大转盘抽奖

php+ajax开发幸运大转盘抽奖，通过奖品库存、中奖次数来计算中奖概率

奖品设置

 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     );

 

获取中奖概率，若是库存为0的则不计算

 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 }

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