php 抽奖

/*

* 抽奖

* @param array $proArr 二维数组

* @return bool

*/

// 例子：v除以v总和->中奖概率

// $prize_arr = array(

// '0' => array('id'=>1,'prize'=>'平板电脑','v'=>1),

// '1' => array('id'=>2,'prize'=>'数码相机','v'=>5),

// '2' => array('id'=>3,'prize'=>'音箱设备','v'=>10),

// '3' => array('id'=>4,'prize'=>'4G优盘','v'=>12),

// '4' => array('id'=>5,'prize'=>'10Q币','v'=>22),

// '5' => array('id'=>6,'prize'=>'下次没准就能中哦','v'=>50),

// );

function get_rand($proArr)

{

$result = array();

foreach ($proArr as $key => $val) {

$arr[$key] = $val['v'];

}

// 概率数组的总概率

$proSum = array_sum($arr);

// 概率数组循环

foreach ($arr as $k => $v) {

$randNum = mt_rand(1, $proSum);

if ($randNum <= $v) {

$result = $proArr[$k];

break;

} else {

$proSum -= $v;

}

}

unset($proArr);

return $result;

}