File upload class_PHP tutorial

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;
    /**Allowed file types to upload*/
    $filetypes = array('gif','jpg','jpge','png');
    /**File upload directory*/
    $savepath = "/usr/htdocs/upload/";
    /**No maximum limit 0 No limit*/
    $maxsize = 0;
    /**Override 0 not allowed 1 allowed*/
    $overwrite = 0;
    $upload = new upload($fileArr, $file_name, $savepath, $filetypes, $overwrite, $maxsize);
    if (!$upload->run())
    {
     echo  "上传失败".$upload->errmsg();
    }
}
?>

Upload class
upload.class.php

//
// +------------------------ --------------------------------------------------+
// | File upload                                                                                                                      🎜>|// | 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 => 'This format file is not allowed to be uploaded',
2 => 'Directory cannot be written',
          3 = > 'File already exists',
                                                                                           " );

/**
* Purpose
* File upload
*
* Example
*
$fileArr['file'] = $file;
$fileArr['name'] = $file_name;
$fileArr['size'] = $file_size;
$fileArr['type'] = $file_type;
// File types allowed to be uploaded
$filetypes = array('gif', 'jpg','jpge','png');
// File upload directory
$savepath = "/usr/htdocs/upload/";
// No maximum limit 0 No limit
$maxsize = 0;
// Overwrite 0 not allowed 1 allowed
$overwrite = 0;
$upload = new upload($fileArr, $file_name, $savepath, $filetypes, $overwrite, $ maxsize);
if (!$upload->run())
{
echo $upload->errmsg();
}
*
* @author whxbb(whxbb@21cn.com)
* @version 0.1
*/
class upload
{
    var $file;
    var $file_name;
    var $file_size;
    var $file_type;

    /**save name*/
    var $savename;
    /**save path*/
    var $savepath;
    /**File format restrictions*/
    var $fileformat = array();
    /**overlay mode*/
    var $overwrite = 0;
    /**file maximum bytes*/
    var $maxsize = 0;
    /**file extension*/
    var $ext;
    /**Error code*/
    var $errno;

    /**
* Constructor
* @param $fileArr File information array 'file' Temporary file path and file name
'name' Upload file name
'size' Upload file size
' Upload file type
* @param savename File save name
* @param savepath File save path
* @param fileformat file format restriction array
* @param overwrite whether to overwrite 1, allow overwriting 0, prohibit overwriting
* @param maxsize Maximum file size
*/
    function upload($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);
    }

    /**Upload*/
    function run()
    {
        /**Check file format*/
        if (!$this->validate_format())
        {
            $this->errno = 1;
            return false;
        }
        /**Check if directory is writable*/
        if(!@is_writable($this->savepath))
        {
            $this->errno = 2;
            return false;
        }
        /**If overwriting is not allowed, check if the file already exists*/
        if($this->overwrite == 0 && @file_exists($this->savepath.$this->savename))
        {
            $this->errno = 3;
            return false;
        }
        /**If there is a size limit, check if the file exceeds the limit*/
        if ($this->maxsize != 0 )
        {
            if ($this->file_size > $this->maxsize)
            {
                $this->errno = 5;
                return false;
            }
        }
        /**File upload*/
       if(!@copy($this->file, $this->savepath.$this->savename))
       {
            $this->errno = 4;
            return false;
       }
       /**Delete temporary files*/
       $this->destory();
       return true;
    }

    /**
* File format check
* @access protect
*/
    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;
    }

    /**
* Get file extension
* access public
*/
    function get_ext()
    {
        $ext = explode(".", $this->file_name);
        $ext = $ext[count($ext) - 1];
        $this->ext = $ext;
    }
    /**
* Set the maximum byte limit for uploaded files
* @param $maxsize file size (bytes) 0: means no limit
* @access public
*/
    function set_maxsize($maxsize)
    {
        $this->maxsize = $maxsize;
    }

    /**
* Set coverage mode
* @param coverage mode 1: Allow coverage 0: Disable coverage
* @access public
*/
    function set_overwrite($overwrite)
    {
        $this->overwrite = $overwrite;
    }

    /**
* Set the file format that is allowed to be uploaded
* @param $fileformat The file extension array that is allowed to be uploaded
* @access public
*/
    function set_fileformat($fileformat)
    {
        $this->fileformat = $fileformat;
    }

/**
* Set the save path
* @param $savepath File saving path: ends with "/"
* @access public
*/
function set_savepath($savepath)
{
$this->savepath = $savepath;
}
/**
* Set the file save name
* @savename save name, if it is empty, the system will automatically generate a random file name
* @access public
*/
function set_savename($savename)
{
if ($savename == '') // If the file name is not set, a random file name is generated
{
srand ((double) microtime() * 1000000);
$rnd = rand(100,999);
$name = date('Ymdhis') + $rnd;
$name = $name." .".$this->ext;
       } else {
                                                                                                                                                              **
* Delete file
* @param $file The name of the file to be deleted
* @access public
*/
function del($file)
{
if(!@unlink($file))
{
$this->errno = 3;
return false;
}
return true;
}
/**
* Delete temporary files
* @access proctect
*/
function destory()
{
$this->del ($this->file);
}

/**
* Get error message
* @access public
* @return error msg string or false
*/
function errmsg()
{
global $UPLOAD_CLASS_ERROR;

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




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