PHP upload/download function

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use PHP to build upload/download function

fun_upload.php

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<?php
//定义一个uploadFile函数
function uploadFile($fileInfo,$path,$allowExt,$maxSize){
//取出$_FILES中的数据
$filename=$fileInfo["name"];
$tmp_name=$fileInfo["tmp_name"];
$size=$fileInfo["size"];
$error=$fileInfo["error"];
$type=$fileInfo["type"];
//取出文件路径中文件的类型的部分
$ext=pathinfo($filename,PATHINFO_EXTENSION);
//确定是否存在存放图片的文件夹，没有则新建一个
if (!file_exists($path)) {  //当目录不存在，就创建目录
  mkdir($path,0777,true);//创建目录
  chmod($path, 0777);//改变文件模式,所有人都有执行权限、写权限、度权限
}
//得到唯一的文件名！防止因为文件名相同而产生覆盖
$uniName=md5(uniqid(microtime(true),true)).'.'.$ext;
//目标存放文件地址
$destination=$path."/".$uniName;
//当文件上传成功，存入临时文件夹，服务器端开始判断
if ($error==0) {
  if ($size>$maxSize) {
    exit("上传文件过大！");
  }
  if (!in_array($ext, $allowExt)) {
    exit("非法文件类型");
  }
  if (!is_uploaded_file($tmp_name)) {
    exit("上传方式有误，请使用post方式");
  }
  //判断是否为真实图片（防止伪装成图片的病毒一类的
  if (!getimagesize($tmp_name)) {//getimagesize真实返回数组，否则返回false
    exit("不是真正的图片类型");
  }
  if (@move_uploaded_file($tmp_name, $destination)) {//@错误抑制符，不让用户看到警告
    echo "文件".$filename."上传成功!";
  }else{
    echo "文件".$filename."上传失败!";
  }
}else{
  switch ($error){
    case 1:
      echo "超过了上传文件的最大值，请上传2M以下文件";
      break;
    case 2:
      echo "上传文件过多，请一次上传20个及以下文件！";
      break;
    case 3:
      echo "文件并未完全上传，请再次尝试！";
      break;
    case 4:
      echo "未选择上传文件！";
      break;
    case 7:
      echo "没有临时文件夹";
      break;
  }
}
return $destination;
}
?>

upload.html

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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"> 
 <meta name="format-detection" content="telephone=no" /> 
<title>文件上传(客户端限制)</title>
<meta charset="utf-8" />
</head>
<body>
<form action="upload3.php" method="post" enctype="multipart/form-data">
<input type="hidden" name="MAX_FILE_SIZE" value="101321" />
请选择您要上传的文件：
<input type="file" name="myFile" accept="image/jpeg,image/gif,text/html"/><br/>
<input type="submit" value="上传"/>
</form>
</body>
</html>

upload3.php

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<?php
header('content-type:text/html;charset=utf-8');
//初始化相关变量
$fileInfo=$_FILES["myFile"];
$maxSize=10485760;//10M,10*1024*1024
$allowExt=array('jpeg','jpg','png','tif');
$path="uploads";
//引入前面封装了的上传函数fun_upload.php
include_once 'fun_upload.php';
uploadFile($fileInfo, $path, $allowExt, $maxSize);
?>

multiple upload

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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"> 
<meta name="format-detection" content="telephone=no" /> 
<meta charset="utf-8" />
<title>多文件上传</title>
</head>
<body>
<form action="upload4.php" method="post" enctype="multipart/form-data">
请选择您要上传的文件：<input type="file" name="myFile1" /><br/>
请选择您要上传的文件：<input type="file" name="myFile2" /><br/>
请选择您要上传的文件：<input type="file" name="myFile3" /><br/>
请选择您要上传的文件：<input type="file" name="myFile4" /><br/>
<input type="submit" value="上传"/>
</form>
</body>
</html>

upload4.php

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<?php
//echo "<pre>";
//print_r($_FILES);
//echo "</pre>";
//exit;
header('content-type:text/html;charset=utf-8');
include_once 'fun_upload.php';
foreach ($_FILES as $fileInfo){	
$file[]=uploadFile($fileInfo);
}
?>

changes in fun_upload.php

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function uploadFile( $fileInfo,$path="uploads",$allowExt=array('jpeg','jpg','png','tif'),$maxSize=10485760
){
$filename=$fileInfo["name"];
$tmp_name=$fileInfo["tmp_name"];
$size=$fileInfo["size"];
$error=$fileInfo["error"];
$type=$fileInfo["type"];

download.php

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<?php
//获取传递过来的路径信息
$filename=$_GET['filename'];
//判断是否有值，没有则不执行下面的php语句
if($filename){
	header("Content-Disposition:attachment;filename=download_$filename");
	//Content-disposition 是 MIME 协议的扩展，MIME 协议指示 MIME 用户代理如何显示附加的文件。
	//格式：content-disposition = "Content-Disposition" ":" disposition-type *( ";" disposition-parm　
	//Content-Disposition为属性名
    //disposition-type是以什么方式下载，如attachment为以附件方式下载
     //disposition-parm为默认保存时的文件名 
	readfile($filename);
	exit;
}
?>
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"> 
 <meta name="format-detection" content="telephone=no" /> 
<title>文件下载</title>
<meta charset="utf-8" />
</head>
<body>
<a href="1.rar">下载1.rar</a>
<br />
<a href="1.jpg">下载1.jpg</a>
<br />
<a href="download.php?filename=1.jpg">通过程序下载1.jpg</a>
</body>
</html>