文件上传类

使用示例:
upload.php
include_once "upload.class.php";
if ($Submit != '')
{
    $fileArr['file'] = $file;
    $fileArr['name'] = $file_name;
    $fileArr['size'] = $file_size;
    $fileArr['type'] = $file_type;
    
    $filetypes = array('gif','jpg','jpge','png');
    
    $savepath = "/usr/htdocs/upload/";
    
    $maxsize = 0;
    
    $overwrite = 0;
    $upload = new upload($fileArr, $file_name, $savepath, $filetypes, $overwrite, $maxsize);
    if (!$upload->run())
    {
     echo  "上传失败".$upload->errmsg();
    }
}
?>











上传类
upload.class.php

//
// +----------------------------------------------------------------------+
// | 文件上传                                                             
|// | 本代码仅供学习讨论之用，允许随意修改                                 
|// | Author: whxbb(whxbb@21cn.com)                                        
|// +----------------------------------------------------------------------+
//
// $Id: upload.class.php,v 1.0 2001/10/14 14:06:57 whxbb Exp $
//

$UPLOAD_CLASS_ERROR = array( 1 => '不允许上传该格式文件',
                             2 => '目录不可写',
                             3 => '文件已存在',
                             4 => '不知名错误',
                             5 => '文件太大'
                            );


class upload
{
    var $file;
    var $file_name;
    var $file_size;
    var $file_type;

    
    var $savename;
    
    var $savepath;
    
    var $fileformat = array();
    
    var $overwrite = 0;
    
    var $maxsize = 0;
    
    var $ext;
    
    var $errno;

    
    function upload($fileArr, $savename, $savepath, $fileformat, $overwrite = 0, $maxsize = 0) {
        $this->file = $fileArr['file'];
        $this->file_name = $fileArr['name'];
        $this->file_size = $fileArr['size'];
        $this->file_type = $fileArr['type'];

        $this->get_ext();
        $this->set_savepath($savepath);
        $this->set_fileformat($fileformat);
        $this->set_overwrite($overwrite);
        $this->set_savename($savename);
        $this->set_maxsize($maxsize);
    }

    
    function run()
    {
        
        if (!$this->validate_format())
        {
            $this->errno = 1;
            return false;
        }
        
        if(!@is_writable($this->savepath))
        {
            $this->errno = 2;
            return false;
        }
        
        if($this->overwrite == 0 && @file_exists($this->savepath.$this->savename))
        {
            $this->errno = 3;
            return false;
        }
        
        if ($this->maxsize != 0 )
        {
            if ($this->file_size > $this->maxsize)
            {
                $this->errno = 5;
                return false;
            }
        }
        
       if(!@copy($this->file, $this->savepath.$this->savename))
       {
            $this->errno = 4;
            return false;
       }
       
       $this->destory();
       return true;
    }

    
    function validate_format()
    {

        if (!is_array($this->fileformat))  // 没有格式限制
            return true;
       $ext = strtolower($this->ext);
        reset($this->fileformat);
        while(list($var, $key) = each($this->fileformat))
        {
            if (strtolower($key) == $ext)
                return true;
        }
        reset($this->fileformat);
        return false;
    }

    
    function get_ext()
    {
        $ext = explode(".", $this->file_name);
        $ext = $ext[count($ext) - 1];
        $this->ext = $ext;
    }
    
    function set_maxsize($maxsize)
    {
        $this->maxsize = $maxsize;
    }

    
    function set_overwrite($overwrite)
    {
        $this->overwrite = $overwrite;
    }

    
    function set_fileformat($fileformat)
    {
        $this->fileformat = $fileformat;
    }

    
    function set_savepath($savepath)
    {
        $this->savepath = $savepath;
    }
    
    function set_savename($savename)
    {
        if ($savename == '')  // 如果未设置文件名，则生成一个随机文件名
        {
            srand ((double) microtime() * 1000000);
            $rnd = rand(100,999);
            $name = date('Ymdhis') + $rnd;
            $name = $name.".".$this->ext;
        } else {
            $name = $savename;
        }
        $this->savename = $name;
    }
    
    function del($file)
    {
        if(!@unlink($file))
        {
            $this->errno = 3;
            return false;
        }
        return true;
    }
    
    function destory()
    {
        $this->del($this->file);
    }

    
    function errmsg()
    {
        global $UPLOAD_CLASS_ERROR;

        if ($this->errno == 0)
            return false;
        else
            return $UPLOAD_CLASS_ERROR[$this->errno];
    }
}
?>