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PHP使用随机数实现简单的概率抽奖

2017-08-30 10:24 309 查看

<!DOCTYPE html>
<head>
<meta charset="utf-8"/>
<title>
使用随机数实现简单的概率抽奖demo
</title>
</head>
<body>
<?php
$msg = '';
$probability = array(
'probability1' => array('name' => '概率1', 'value' => 10),
'probability2' => array('name' => '概率2', 'value' => 20),
'probability3' => array('name' => '概率3', 'value' => 30),
'probability4' => array('name' => '概率4', 'value' => 40),
);
if ($_POST) {
$probability_total = 0;
foreach ($probability as $k => $v) {
$probability[$k]['value'] = intval($_POST[$k]);
$probability_total +=$_POST[$k];
}
$award_line = array();
$dot = 0;
foreach ($probability as $k => $v) {
$award_line[$k]['name'] = $v['name'];
$award_line[$k]['start'] = $dot;
$dot = $dot + $v['value'];
$award_line[$k]['end'] = $dot;
}
$rand_num = mt_rand(1, $probability_total);
$hit = 0;
foreach ($award_line as $k => $v) {
if ($rand_num > $v['start'] && $rand_num <= $v['end']) {//命中
$hit = $v['name'];
break;
}
}
$msg = "随机数为{$rand_num}，命中{$hit}";
}
?>
<form method = "post" action = "">
<?php foreach ($probability as $key => $value): ?>
<p>
<?php echo $value['name']; ?>
<input type = "text" name = "<?php echo $key; ?>" value = "<?php echo $value['value']; ?>" />
</p>
<?php endforeach; ?>
<input type = "submit" name = "submit" value = "提交" />
<div><?php echo $msg; ?></div>
</form>
</body>
</html>

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