<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>文件上传/下载页面</title>
</head>
<body>
<form action="upFile.php" method="post" enctype="multipart/form-data" >
<label>请选择需要上传的文件：</label> <input type="file" name = "upFile"> <br><br>
<label> 请确定开始上传此文件：</label> <input type="submit" value="上传">
</form>
<br><br>
<form action="down.php" method="get">
<input type="text" name="downFileName" value="demo.rar">
<input type="submit" value="下载">
</form>
</body>
</html>
//upFile.php
<?php
require 'upFun.php';
print_r(upFile($_FILES['upFile']));
?>
//down.php
<?php
require 'upFun.php';
$downFile=$_GET['downFileName'];
dowFile($downFile);
?>
//upFun.php
<?php
function dowFile($fileName)
{
header('Accept-Length:'.filesize($fileName));
// 主要是这一行
header('Content-Disposition:attachment;filename='.basename($fileName));
readfile($fileName);
}
function upFile($fileInfo,$uploadPath='./upload',$allowExt = ['png','jpg','jpeg','gif'
,'txt','html'],$maxSize = 2000000){
if($fileInfo['error'] ===0){
//返回文件后缀名
$ext = strtolower(pathinfo($fileInfo['name'],PATHINFO_EXTENSION));
if(!in_array($ext,$allowExt)){
return '非法文件类型';
}
if(!is_uploaded_file($fileInfo['tmp_name'])){
return '非法上传！';
}
if(!is_dir($uploadPath)){
mkdir($uploadPath,0777,true);
}
//文件名，用md生成的
$uniName = md5(uniqid(microtime(true),true)).".".$ext;
//新文件名
$dest = $uploadPath."/".$uniName;
if(!move_uploaded_file($fileInfo['tmp_name'],$dest))
{
return '文件上传失败';
}
return '文件上传成功';
}else{
switch ($fileInfo['error']){
case 1:
$res = '上传的文件超过了php.ini 中
upload_max_filesize 选项限制的值';
break;
case 2:
$res = '上传文件的大小超过了HTML表单中MAX_FILE_SIZE 选项指定的值';
break;
case 3:
$res = '文件只有部分被上传';
break;
case 4:
$res ='没有文件被上传';
break;
case 6:
case 7:
$res = '系统错误';
break;
}
return $res;
}
}
