php大转盘抽奖

<?php

$prize_arr = array(
'0' => array('id' => 1, 'min' => 1, 'max' => 29, 'prize' => '一等奖', 'v' => 1),
'1' => array('id' => 2, 'min' => 302, 'max' => 328, 'prize' => '二等奖', 'v' => 2),
'2' => array('id' => 3, 'min' => 242, 'max' => 268, 'prize' => '三等奖', 'v' => 5),
'3' => array('id' => 4, 'min' => 182, 'max' => 208, 'prize' => '四等奖', 'v' => 7),
'4' => array('id' => 5, 'min' => 122, 'max' => 148, 'prize' => '五等奖', 'v' => 10),
'5' => array('id' => 6, 'min' => 62, 'max' => 88, 'prize' => '六等奖', 'v' => 25),
'6' => array('id' => 7, 'min' => array(32, 92, 152, 212, 272, 332),
'max' => array(58, 118, 178, 238, 298, 358), 'prize' => '七等奖', 'v' => 50)
//min数组表示每个个奖项对应的最小角度 max表示最大角度
//prize表示奖项内容，v表示中奖几率(若数组中七个奖项的v的总和为100，如果v的值为1，则代表中奖几率为1%，依此类推)
);

function getRand($proArr) {
$data = '';
$proSum = array_sum($proArr); //概率数组的总概率精度

foreach ($proArr as $k => $v) { //概率数组循环
$randNum = mt_rand(1, $proSum);
if ($randNum <= $v) {
$data = $k;
break;
} else {
$proSum -= $v;
}
}
unset($proArr);

return $data;
}

foreach ($prize_arr as $v) {
$arr[$v['id']] = $v['v'];
}$prize_id = getRand($arr); //根据概率获取奖项id$res = $prize_arr[$prize_id - 1]; //中奖项
$min = $res['min'];
$max = $res['max'];
if ($res['id'] == 7) { //七等奖
$i = mt_rand(0, 5);
$data['angle'] = mt_rand($min[$i], $max[$i]);
} else {
$data['angle'] = mt_rand($min, $max); //随机生成一个角度
}
$data['prize'] = $res['prize'];echo json_encode($data);

?>