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砸金蛋概率
function getRand($proArr) {
$result = ‘‘;
//概率数组的总概率精度
$proSum = array_sum($proArr);
//概率数组循环
foreach ($proArr as $key => $proCur) {
$randNum = mt_rand(1, $proSum);
if ($randNum <= $proCur) {
$result = $key;
break;
} else {
$proSum -= $proCur;
}
}
unset ($proArr);
return $result;
}
<?php
$prize_arr = array(
‘0‘ => array(‘id‘=>1,‘prize‘=>‘平板电脑‘,‘v‘=>3),
‘1‘ => array(‘id‘=>2,‘prize‘=>‘数码相机‘,‘v‘=>5),
‘2‘ => array(‘id‘=>3,‘prize‘=>‘音箱设备‘,‘v‘=>10),
‘3‘ => array(‘id‘=>4,‘prize‘=>‘4G优盘‘,‘v‘=>12),
‘4‘ => array(‘id‘=>5,‘prize‘=>‘Q币10元‘,‘v‘=>20),
‘5‘ => array(‘id‘=>6,‘prize‘=>‘下次没准就能中哦‘,‘v‘=>50),
);
foreach ($prize_arr as $key => $val) {
$arr[$val[‘id‘]] = $val[‘v‘];
}
//print_r($arr);
$rid = getRand($arr); //根据概率获取奖项id
$res[‘msg‘] = ($rid==6)?0:1;
$res[‘prize‘] = $prize_arr[$rid-1][‘prize‘]; //中奖项
echo json_encode($res);exit;
?>
自己用的
$prize_arr = array(
‘0‘ => array(‘id‘=>1,‘prize‘=>‘1积分‘,‘v‘=>90),
‘1‘ => array(‘id‘=>2,‘prize‘=>‘10积分‘,‘v‘=>9),
‘2‘ => array(‘id‘=>3,‘prize‘=>‘100积分‘,‘v‘=>1)
);
foreach ($prize_arr as $key => $val){
$arr[$val[‘id‘]] = $val[‘v‘];
}
$rid = getRand($arr);
$_data[‘title‘] = $prize_arr[$rid-1][‘prize‘]; //中奖项
砸金蛋概率