PHP文件下载上传类

刚学了一点PHP，自己觉得入门很快，其实也很简单，其思维就是从其C、C++语言中搬迁而来。有很多不足之处，大家指出来：

class fileup
{
private $filePath;//文件路径
private $fileField;//当前文件
private $originName;//文件原名
private $tmpFileName;//临时文件名
private $fileType;//文件类型
private $filesize;//文件大小
private $newFileName;//上传文件名
private $allowType=array('txt','doc','pdf','docx','jpeg','zip','xml','html','js','jpg','gif','png','doc','swf','rar','zip');
private $MaxSzie=10000000000;
private $IsUserDefName=false;
private $randName;//随机文件名
private $ErrorNum=0;//错误现实，file上床等
private $isCoverMode=true;
private $extension;//文件拓展名
private $fileCount=0;
function __construct($filepath)
{
     $this->filePath=$filepath;
     $this->getInfor();
    file_type();
}
function uploadFile($fileup)
    //这里传来的是$_FILE['name']
{

       $this->newFileName=$_SERVER['server_time'].$fileup['name'];
       if($fileup['size']>$this->filesize)
       {
           return ;
       }
       if(!in_array($fileup['type'],$this->allowType))
       {
           return ;
       }
       if(is_uploaded_file($fileup['tmp_name']))
       {
           return ;
       }
       if(move_uploaded_file($fileup['tmp_name'],$this->fileField.$this->newFileName))
       {
           return 1;
       }
       //表示为上传成功
}
function downloadFile()
{
    header("Content-Type:".$this->fileType);
    header("Content-Disposition:attachment;filename='".$this->newFileName."'");
    header("Content-Length:".$this->filesize);
    header($this->newFileName);
}
private function getInfor()
{
   $this->fileField=pathinfo($this->filePath);
   $file=basename($this->filePath);
   $this->filesize=filesize($file);
   $infor=pathinfo($file);
   $this->extension=$infor['extension'];

}
function show_files()
{
    $this->readfile($this->filePath);
    echo "the acount of file is ".$this->fileCount."<br/>";
}
private function readfile($file_show)
{

    $file=opendir($file_show);
    while($files=readdir($file))
    {
        if(is_file($files))
        {
            echo $file.'\\'. $files."<br>";
            $this->fileCount++;
        }
        if(is_dir($files))
        {
            readdir($files);
        }
    }
}
private function file_type()
{
    switch ($this->extension)
    {
        case 'html':
        case "log":
        case "php":
        case "phtml":
            $this->fileType="text/plain";
            break;
        case "css":
            $this->fileType="text/css";
            break;
        case "xml":
        case "xsl":
            $this->fileType="text/xml";
            break;
        case "js":
            $this->fileType="text/javascript";
            break;
        case "gif":
            $this->fileType="image/gif";
            break;
        case "jpeg":
        case "jpg":
            $this->fileType="image/jpg";
            break;
        case "png":
            $this->fileType="image/png";
            break;
        case "pdf":
            $this->fileType="application/pdf";
            break;
        case "doc":
        case "dot":
        case "docx":
            $this->fileType="application/msword";
            break;
        case "zip":
            $this->fileType="application/zip";
            break;
        case "rar":
            $this->fileType="application/rar";
            break;
        case "swf":
            $this->fileType="application/x-shockwave-flash";
            break;
        case "bin":
        case "exe":
        case "com":
        case "dll":
        case "class":
            $this->fileType="application/octet-steam";
            break;
    }
}

}

//这里是单文件上传，多文件上传也是同理，无非是$_FILE['']['tmp_name'][size]上传的文件等多少等一个数组，前台有form表单等mutifile，name为一个数组就可以了post方式，ajax上传。后台解析保存--本地或有数据库文件名

自己是新手，完全自己学的，能力有限，希望大家帮助一下。