<?php
//====================================================
// FileName: upfile.class.php
// Summary: 文件上传类
// Author: millken(迷路林肯)
// LastModifed: 2008-6-4
// copyright (c)2008 millkengmail.com
//====================================================
if(!defined('OK'))exit(__FILE__.'Access Denied');
class upfile {
public $ExtensionFileFormat = array();
public $returninfo = array();

private $ImageFileFormat = array('gif','bmp','jpg','jpe','jpeg','png');
private $OtherFileFormat = array('zip','pdf','rar','xls','doc','ppt','csv');
private $savePath;
private $attachment_path = './upfiles/';
private $overwrite = false; # 同名时是否覆盖
private $maxSize = 0; # 文件最大字节，为0时不限制大小
private $ext;
private $errno = 0;

/* 构造函数
* (string)$savePath 文件保存路径，默认为$attachment_path
* (array)$extensionFileFormat 自定义上传文件的扩展名，未设置时为$ImageFileFormat || $OtherFileFormat
* (bool)$overwrite 是否覆盖同名文件
*/
public function __construct($savePath='',$extensionFileFormat = array(),$overwrite = false) {
$this->savePath = empty($savePath)?$this->attachment_pathsavePath.'/';
$this->extensionFileFormat = is_array($extensionFileFormat)?$extensionFileFormat:array();
$this->overwrite = is_bool($overwrite)?$overwrite:false;
}

/*上传函数
* (array)$files 待上传的文件数组$_FILES['attach']
* (number)$maxSize 文件的最大字节数，默认为0不限制上传大小
*/
public function upload($files,$maxSize=0) {
$this->maxSize = is_numeric($maxSize)?$maxSize:0;
if(isset($files) && is_array($files)) {
if(is_array($files['name'])) {
foreach($files as $key => $var) {
foreach($var as $id => $val) {
$attachments[$id][$key] = $val;
}
}
} else {
$attachments[] = $files;
}
}
self::check_file_type($attachments);
if(empty($this->filelist)) {
$this->log .= "待上传的文件列表为空。\n";
return array();
}
if(!self::makeDirectory() || !is_writable($this->savePath)) {
$this->log .= $this->savePath . "不能创建或其权限为不可写。\n";
return array();
}
$filearray = array();
foreach($this->filelist as $k=>$f) {
if($this->maxSize && $f['size']>$this->maxSize) {
$this->log .= $f['name'] . "其大小超过了设定的值：" . $this->maxSize ."\n";
}elseif($this->overwrite == false && file_exists($this->savePath . $f['name'])) {
$this->log .= $f['name'] . "已经存在于目录：" . $this->savePath . "\n";
}else{
unlink($this->savePath . $f['name']);
if(move_uploaded_file($f['tmp_name'],$this->savePath . mb_convert_encoding($f['name'],'gbk','utf-8'))) {//如果不进行编码转换，中文将无法支持
$this->log .= $f['name'] . "成功上传到目录：". $this->savePath ."\n";
$filearray[$k] = $this->savePath . $f['name'];
}else{
$this->log .= $f['name'] . "上传失败。\n";
}
}
}
return $filearray;
}

/*检测文件的类型
*(array)$files 文件数组
*/
private function check_file_type($files) {
$this->filelist = array();
foreach($files as $key=>$file) {
if($file['error'] == 0) {
$ext = strtolower(substr($file['name'], strrpos($file['name'], '.') + 1));
$str = file_get_contents($file['tmp_name'],FALSE,NULL,0,20);
if((in_array($ext,array('jpg','jpeg')) && substr($str ,0, 3) !== "\xFF\xD8\xFF") || ($ext == 'gif' && substr($str ,0, 4) !== 'GIF8') || ($ext == 'png' && substr($str ,0, 8) !== "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") || ($ext == 'bmp' && substr($str ,0, 2) !== 'BM') || ($ext == 'swf' && (substr($str ,0, 3) !== 'CWS' || substr($str ,0, 3) !== 'FWS')) || ($ext == 'zip' && substr($str ,0, 4) !== "PK\x03\x04") || ($ext == 'rar' && substr($str ,0, 4) !== 'Rar!') || ($ext == 'pdf' && substr($str ,0, 4) !== "\x25PDF") || ($ext == 'chm' && substr($str ,0, 4) !== 'ITSF') || ($ext == 'rm' && substr($str ,0, 4) !== "\x2ERMF") || ($ext == 'exe' && substr($str ,0, 2) !== "MZ") || (in_array($ext,array('doc','xls','ppt')) && substr($str ,0, 4) !== "\xD0\xCF\x11\xE0")) {
$this->log .= $file['name'] . "文件类型与文件内容不符合。\n";
}elseif((!empty($this->extensionFileFormat) && in_array($ext,$this->extensionFileFormat)) || (empty($this->extensionFileFormat) && (in_array($ext,$this->ImageFileFormat) || in_array($ext,$this->OtherFileFormat)))) {
$this->filelist[$key] = $file;
}else{
$this->log .= $file['name'] . "不符合上传文件的类型。\n";
unlink($file['tmp_name']);
}
}
}
}

/*生成上传目录
*
*/
private function makeDirectory() {
$directoryName = str_replace("\\","/", $this->savePath);
$dirNames = explode('/', $directoryName);
$total = count($dirNames);
$temp = '';
for($i=0; $i<$total; $i++)
{
$temp .= $dirNames[$i].'/';
if (!is_dir($temp))
{
$oldmask = umask(0);
if (!mkdir($temp, 0777)) return false;
umask($oldmask);
}
};
if(is_dir($this->savePath)) {
return true;
} else {
return false;
};
}
}

?>