PHP使用随机数实现简单的概率抽奖

来源：互联网发布：java程序设计基础答案编辑：程序博客网时间：2024/05/29 09:30
<!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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