php中关于普通表单多文件上传的处理方法

答案：
然而有些情况只需要传递几个文件，而且文件体积并不太大，这种情况下使用组件则有点牛刀杀鸡的感觉，通过html自带的<input type="file">表单就可以实现需要的功能，关键在于后台接收程序的处理。 

php处理上传做的很方便，上传文件的信息通过服务器自动处理到$_FILES数组中，开发者只需要使用的内置处理函数简单操作就可以啦。ASP开发者则没有这么幸运，官方并没有提供直接的处理方法，需要开发者自己设计，这时就需要开发者了解IIS对enctype="multipart/form-data"表单的处理方式，IIS把enctype="multipart/form-data"表单提交的数据存储成二进制数据，以二进制格式返回给开发者，开发者则需要通过LenB、MidB的字节处理函数来分析获取的上传内容，客户端发送的具体表单数据格式，可以了解下HTTP RFC1867协议传输格式方面的知识。 

下面是我处理多个文件上传的方法，包括php和asp两个版本。 

php：WEBSITE_DIRROOT代表网站根目录： 
复制代码 代码如下:
 
<?php 
/* 
* class: 文件上传类 
* author: 51JS.COM-ZMM 
* date: 2011.1.20 
* email: 304924248@qq.com 
* blog: http://www.cnblogs.com/cnzmm/ 
*/ 

class Upload { 
public $up_ext=array(), $up_max=5210, $up_dir; 
private $up_name, $up_rename=true, $up_num=0, $up_files=array(), $up_ret=array(); 

function __construct($name, $ext=array(), $rename=true) { 
if (!empty($name)) { 
$this->up_name = $name; 
!empty($ext) && $this->up_ext = $ext; 
$this->up_rename = $rename; 
$this->up_dir = WEBSITE_DIRROOT. 
$GLOBALS['cfg_upload_path']; 
$this->InitUpload(); 
} else { 
exit('upload文件域名称为空，初始化失败！'); 
} 
} 

private function InitUpload() { 
if (is_array($_FILES[$this->up_name])) { 
$up_arr = count($_FILES[$this->up_name]); 
$up_all = count($_FILES[$this->up_name], 1); 
$up_cnt = ($up_all - $up_arr) / $up_arr; 
for ($i = 0; $i < $up_cnt; $i ++) { 
if ($_FILES[$this->up_name]['error'][$i] != 4) { 
$this->up_files[] = array( 
'tmp_name' => $_FILES[$this->up_name]['tmp_name'][$i], 
'name' => $_FILES[$this->up_name]['name'][$i], 
'type' => $_FILES[$this->up_name]['type'][$i], 
'size' => $_FILES[$this->up_name]['size'][$i], 
'error' => $_FILES[$this->up_name]['error'][$i] 
); 
} 
} 
$this->up_num = count($this->up_files); 
} else { 
if (isset($_FILES[$this->up_name])) { 
$this->up_files = array( 
'tmp_name' => $_FILES[$this->up_name]['tmp_name'], 
'name' => $_FILES[$this->up_name]['name'], 
'type' => $_FILES[$this->up_name]['type'], 
'size' => $_FILES[$this->up_name]['size'], 
'error' => $_FILES[$this->up_name]['error'] 
); 
$this->up_num = 1; 
} else { 
exit('没找找到需要upload的文件！'); 
} 
} 

$this->ChkUpload(); 
} 

private function ChkUpload() { 
if (empty($this->up_ext)) { 
$up_mime = array('image/wbmp', 'image/bmp', 'image/gif', 'image/pjpeg', 'image/x-png'); 
foreach ($this->up_files as $up_file) { 
$up_allw = false; 
foreach ($up_mime as $mime) { 
if ($up_file['type'] == $mime) { 
$up_allw = true; break; 
} 
} 
!$up_allw && exit('不允许上传'.$up_file['type'].'格式的文件！'); 

if ($up_file['size'] / 1024 > $this->up_max) { 
exit('不允许上传大于 '.$this->up_max.'K 的文件！'); 
} 
} 
} else { 
foreach ($this->up_files as $up_file) { 
$up_ext = end(explode('.', $up_file['name'])); 

$up_allw = false; 
foreach ($this->up_ext as $ext) { 
if ($up_ext == $ext) { 
$up_allw = true; break; 
} 
} 
!$up_allw && exit('不允许上传.'.$up_ext.'格式的文件！'); 

if ($up_file['size'] / 1024 > $this->up_max) { 
exit('不允许上传大于 '.$this->up_max.'K 的文件！'); 
} 
} 
} 

$this->Uploading(); 
} 

private function Uploading() { 
if (IO::DIRCreate($this->up_dir)) { 
if (chmod($this->up_dir, 0777)) { 
if (!empty($this->up_files)) { 
foreach ($this->up_files as $up_file) { 
if (is_uploaded_file($up_file['tmp_name'])) { 
$file_name = $up_file['name']; 
if ($this->up_rename) { 
$file_ext = end(explode('.', $file_name)); 
$file_rnd = substr(md5(uniqid()), mt_rand(0, 26), 6); 
$file_name = date('ymdHis').'_'.$file_rnd.'.'.$file_ext; 
} 
$file_name = $this->up_dir.'/'.$file_name; 

if (move_uploaded_file($up_file['tmp_name'], $file_name)) { 
$this->up_ret[] = str_replace(WEBSITE_DIRROOT, '', $file_name); 
} else { 
exit('文件上传失败！'); 
} 
} 
} 
} 
} else { 
exit('未开启写入权限！'); 
} 
} else { 
exit('上传目录创建失败！'); 
} 
} 

public function GetUpload() { 
return empty($this->up_ret) ? false : $this->up_ret; 
} 

function __destruct() {} 
} 
?> 

 
asp： 
复制代码 代码如下:
 
<% 
Class MultiUpload 

REM PUBLIC-VARIANT 

Public Form, IsFinished 
Private bVbCrlf, bSeparate, fPassed, formData, fileType, fileSize, folderPath, _ 
fRename, fIMGOnly, itemCount, chunkSize, bTime, sErrors, sAuthor, sVersion 
Private itemStart(), itemLength(), dataStart(), dataLength(), itemName(), itemData(), extenArr(), httpArr() 

REM CLASS-INITIALIZE 

Private Sub Class_Initialize 
Call InitVariant 
Server.ScriptTimeOut = 1800 
Set Form = Server.CreateObject("Scripting.Dictionary") 
sAuthor = "51JS.COM-ZMM" 
sVersion = "MultiUpload Class 3.0" 
End Sub 

REM CLASS-ATTRIBUTES 

Public Property Let AllowType(byVal sType) 
Dim regEx 
Set regEx = New RegExp 
regEx.Pattern = "^(\w+\|)*\w+$" 
regEx.Global = False 
regEx.IgnoreCase = True 
If regEx.Test(sType) Then fileType = "|" & Ucase(sType) & "|" 
Set regEx = Nothing 
End Property 

Public Property Let MaxSize(byVal sSize) 
If IsNumeric(sSize) Then fileSize = CDbl(FormatNumber(CCur(sSize), 2)) 
End Property 

Public Property Let SaveFolder(byVal sFolder) 
folderPath = sFolder 
End Property 

Public Property Let CommonPassed(byVal bCheck) 
fPassed = bCheck 
End Property 

Public Property Let FileRenamed(byVal bRename) 
fRename = bRename 
End Property 

Public Property Let FileIsAllImg(byVal bOnly) 
fIMGOnly = bOnly 
End Property 

Public Property Get SaveFolder 
SaveFolder = folderPath 
End Property 

Public Property Get FileRenamed 
FileRenamed = fRename 
End Property 

Public Property Get FileIsAllImg 
FileIsAllImg = fIMGOnly 
End Property 

Public Property Get ErrMessage 
ErrMessage = sErrors 
End Property 

Public Property Get ClsAuthor 
ClsAuthor = sAuthor 
End Property 

Public Property Get ClsVersion 
ClsVersion = sVersion 
End Property 

REM CLASS-METHODS 

Private Function InitVariant 
IsFinished = False 
bVbCrlf = StrToByte(vbCrlf & vbCrlf) 
bSeparate = StrToByte(String(29, "-")) 
fPassed = False 
fileType = "*" 
fileSize = "*" 
fRename = True 
fIMGOnly = True 
itemCount = 0 
chunkSize = 1024 * 128 
bTime = Now 
sErrors = "" 
End Function 

Public Function GetUploadData 
Dim curRead : curRead = 0 
Dim dataLen : dataLen = Request.TotalBytes 
Dim appName : appName = "PROGRESS" & IPToNum(GetClientIPAddr) 
Dim streamTmp 
Set streamTmp = Server.CreateObject("ADODB.Stream") 
streamTmp.Type = 1 
streamTmp.Open 
Do While curRead < dataLen 
Dim partLen : partLen = chunkSize 
If partLen + curRead > dataLen Then partLen = dataLen - curRead 
streamTmp.Write Request.BinaryRead(partLen) 
curRead = curRead + partLen 
LetProgress appName, Array(cur

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