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

 $prizes = array(
         0 => array(
             "id" => 0, //中奖id
             "name" => "谢谢参与", //奖品名称
             "count" => "100", //库存
         ),
         1 => array(
             "id" => 1,
             "name" => "罗浮山门票",
             "count" => "40",
         ),
         2 => array(
             "id" => 2,
             "name" => "罗浮山嘉宝田温泉体验券",
             "count" => "40",
         ),
         3 => array(
             "id" => 3,
             "name" => "精美旅游书籍《山水酿惠州》",
             "count" => "40",
         ),
         4 => array(
             "id" => 4,
             "name" => "碧海湾漂流门票",
             "count" => "40",
         ),
         5 => array(
             "id" => 5,
             "name" => "南昆山门票",
             "count" => "40",
         ),
         6 => array(
             "id" => 6,
             "name" => "云顶温泉精美礼品",
             "count" => "40",
         ),
     );

获取中奖概率，若是库存为0的则不计算

 function getRand($proArr, $proCount) {
     $result = '';
     $proSum = 0;
     foreach ($proCount as $key => $val) {
         if ($val <= 0) {
             continue;
         } else {
             $proSum = $proSum + $proArr[$key];
         }
     }
     foreach ($proArr as $key => $proCur) {
         if ($proCount[$key] <= 0) {
             continue;
         } else {
             $randNum = mt_rand(1, $proSum);
             if ($randNum <= $proCur) {
                 $result = $key;
                 break;
             } else {
                 $proSum -= $proCur;
             }
         }
     }
     unset($proArr);
     return $result;
 }

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