老师下载文件怎么实现，出现乱码了
<?php
require_once './lib/fun.php';
error_reporting(E_ALL^E_NOTICE^E_WARNING);
header('content-type:text/html;charset=utf-8');
$dsn = "mysql:host=localhost;dbname=king";
$pdo = new PDO($dsn,'root','123456');
$pdo->exec('set names utf8');
$upload=$_FILES['upload']['tmp_name'];
// var_dump($upload);
$info=$_POST['info'];
//图片和描述必须要存在;
if ($info!=''&&$upload!='') {
//先插入数据
$sql2 = "INSERT INTO uploaddemo(info) values('$info') ";
$stmt = $pdo->prepare($sql2);
$result = $stmt->execute();
//然后查询数据，把ID值赋给图片名称
$sql = "SELECT * FROM uploaddemo order by id desc ";
$stmt = $pdo->prepare($sql);
$result = $stmt->execute();
$data = $stmt->fetchAll(PDO::FETCH_ASSOC);
$upload = new Upload();
//吧ID值传参给上传函数
$upload->handleUploadFile($data[0]['id']);
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
<title>文件上传和下载</title>
<!-- Bootstrap -->
<link href="style/css/bootstrap.min.css" rel="stylesheet">
<link href="style/css/site.min.css" rel="stylesheet">
<style>
.projects .thumbnail .caption {
height: auto;
max-width: auto;
}
.image{
margin:10px auto;
border-radius:5px;
overflow:hidden;
border:1px solid #CCC;
}
.image .caption P{
text-align: center;
}
</style>
</head>
<body>
<!--导航栏-->
<div class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<div class="navbar-header">
<button class="navbar-toggle collapsed" type="button" data-toggle="collapse" data-target=".navbar-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand hidden-sm" href="index.php" onclick="_hmt.push(['_trackEvent', 'navbar', 'click', 'navbar-首页'])">慕课网</a>
</div>
<div class="navbar-collapse collapse" role="navigation">
<ul class="nav navbar-nav">
<li class="hidden-sm hidden-md">
<a href="" target="_blank"></a>
</li>
<li>
<a href="" target="_blank"></a>
</li>
</ul>
</div>
</div>
</div>
<!--导航栏结束-->
<!--巨幕-->
<div class="jumbotron masthead">
<div class="container">
<h1>文件上传下载</h1>
<h2>实现文件的上传和下载功能</h2>
<p class="masthead-button-links">
<form class="form-inline" action="index.php" method="get">
<div class="form-group">
<input type="text" class="form-control" id="exampleInputName2" placeholder="输入搜索内容" name="key" value="">
<button class="btn btn-default" type="submit">搜索</button>
<button type="button" class="btn btn-primary btn-default" data-toggle="modal" data-target="#myModal"> 上传 </button>
</div>
</form>
</p>
</div>
</div>
<!--巨幕结束-->
<!-- 模态框 -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
<div class="modal-dialog" role="document">
<form class="form-inline" action="index.php" method="post" enctype="multipart/form-data">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button>
<h4 class="modal-title" id="myModalLabel">上传图片</h4>
</div>
<div class="modal-body">
<p>选择图片：</p><input type="file" id="image" name="upload">
<br/>
<p>图片描述：</p><textarea class="form-control" cols="75" name="info" id="info"></textarea>
<br/><br/>
<p>
是否添加水印：
<select name="mark">
<option value="1">添加</option>
<option value="0">不添加</option>
</select>
</p>
<br/>
<p>
图片宽度比例：
<select name="scale">
<option value="800*600">800*600</option>
<option value="600*450">600*450</option>
<option value="400*300">400*300</option>
</select>
</p>
</div>
<div class="modal-footer">
<button type="submit" class="btn btn-default" name="submit" id="submit" onclick="show(this)">上传</button>
<button type="reset" class="btn btn-primary">重置</button>
</div>
</div>
</form>
</div>
</div>
<!--模态框结束-->
<div class="container projects">
<div class="projects-header page-header">
<h2>上传图片展示</h2>
<p>将上传的图片展示在页面中</p>
</div>
<div class="row">
<?php
//把数据库内容遍历出来
$sql = "SELECT * FROM uploaddemo order by id desc ";
$stmt = $pdo->prepare($sql);
$result = $stmt->execute();
$data = $stmt->fetchAll(PDO::FETCH_ASSOC);
foreach ($data as $key => $value) {
$username=(int)$value['id'];
?>
<div class="col-sm-6 col-md-3 col-lg-4 ">
<div class="image"> <!--把函数中的得到的图片名在此使用 -->
<a href="index.php?filename=<?php echo $username.'.jpg' ?>" class="btn btn-lg btn-success" ><img class="img-responsive" src="<?php echo './upload/'.($username).'.'.pathinfo($info['name'],PATHINFO_EXTENSION) ?>"></a>
<div class="caption">
<p>
<?php echo $value['info']; ?>
</p>
</div>
</div>
</div>
<?php
$filename= $_REQUEST['filename'];
$filepath = './upload/'.$filename;
if(!file_exists($filepath)) {
exit('文件不存在');
} else {
header("Content-type: application/octet-stream");
header('Content-Disposition: attachment; filename=' .basename($filepath));
readfile($filepath);
}
} ?>
</div>
<!--分页-->
<nav aria-label="Page navigation" style="text-align:center">
<ul class="pagination pagination-lg">
<li>
<a href="" aria-label="Previous">
<span aria-hidden="true">首页</span>
</a>
</li>
<li><a href="">1</a></li>
<li><a href="">2</a></li>
<li><a href="">3</a></li>
<li><a href="">4</a></li>
<li><a href="">5</a></li>
<li>
<a href="" aria-label="Next">
<span aria-hidden="true">尾页</span>
</a>
</li>
</ul>
</nav>
</div>
<footer class="footer container">
<div class="row footer-bottom">
<ul class="list-inline text-center">
<h4><a href="class.imooc.com" target="_blank">class.imooc.com</a> | 慕课网</h4>
</ul>
</div>
</footer>
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="style/js/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="style/js/bootstrap.min.js"></script>
<script type="text/JavaScript">
function show(){
if(document.getElementById("image").value == ''){
alert('请选择图片');
}
if(document.getElementById("info").value == ''){
alert('请输入图片描述');
}
}
</script>
</body>
</html>
正在回答
您好，您的下载是在此页面操作的吗？小慕没有找到下载的按钮呢。乱码是指什么时候出现的乱码呢？建议同学提交作业，将相关页面以及数据库全部提交，只有单个页面，没有相关代码和数据库，小慕也是无法测试呢。祝学习愉快！
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