php 上传

<?php

define('NO_FILE', '不存在上传文件');

define('NOT_ALLOW_EXT', '文件类型不在允许范围内');

define('NOT_ALLOW_SIZE', '文件大小不在允许范围内');

define('HAS_THE_FILE', '该文件已经存在');

define('UPLOAD_FAILED', '上传失败');

define('UPLOAD_SUCCESS', '上传成功');

class file_uploader

{

    var $_file;

    var $_filesize;

    var $_fileext;

    var $_filedir;

    var $_filename;

    var $_filetmpname;



    var $allowsize;

    var $allowext;



    var $neednewname;

    var $newname;

    var $syslang;



    var $report;



    function ready($filedir = '', $file, $allowsize = '', $allowext = '', $neednewname = false, $report = 0){

        $this->_filedir = is_dir($filedir) ? $filedir : '';

        if(empty($file) || !isset($file['size']) || $file['size'] == 0) $this->error(NO_FILE);

        $this->_filesize = $file['size'];

        $this->_filename = $file['name'];

        $this->_filetmpname = $file['tmp_name'];



        $this->allowsize = $allowsize;

        $this->allowext = $allowext;



        $this->neednewname = ($neednewname) ? true : false;

        $this->newname = '';



        $this->report = $report;

    }



    function do_upload(){

        if(!is_uploaded_file($this->_filetmpname)) $this->error(NO_FILE);

        if($this->chk_ext()){

            $this->error(NOT_ALLOW_EXT);

            return '';

        }

        if($this->chk_size()){

            $this->error(NOT_ALLOW_SIZE);

            return '';

        }

        if($this->neednewname) $this->newname = $this->generate_name().".".$this->get_fileext();

        if($this->chk_hasfile()){

            $this->error(HAS_THE_FILE);

            return '';

        }

        $filename = empty($this->newname) ? @iconv('utf-8','gb2312',$this->_filename) : $this->newname;

        @chmod($this->_filedir.$filename, 0777);

        if(move_uploaded_file($this->_filetmpname, $this->_filedir.$filename)){

            return $this->result();

        }else{

            $this->error(UPLOAD_FAILED);

            return '';

        }

    }



    function chk_ext(){

        if(empty($this->allowext) || in_array($this->get_fileext(), explode("|",$this->allowext))) return false;

        return true;

    }



    function chk_size(){

        if(empty($this->allowsize) || get_filesize <= $this->allowsize*1024*1024) return false;

        return true;

    }



    function get_filesize(){

        return $this->_filesize;

    }



    function get_fileext(){

        return substr($this->_filename,strrpos($this->_filename,".")+1);

    }



    function generate_name(){

        return substr(md5(time()),26);

    }



    function chk_hasfile(){

        return is_file($this->_filedir.$this->_filename);

    }



    function error($tip){

        echo $tip;

    }



    function result(){

        if($this->report){

            $filename = empty($this->newname) ? $this->_filename : $this->newname;

            $arr = array('filename' => $filename, 'filesize' => $this->_filesize, 'tip' => UPLOAD_SUCCESS);

            return $arr;

        }else{


            return UPLOAD_SUCCESS;

        }

    }

}

/***使用方法与参数说明***/

/***

第一个参数$dir 为上传文件存放的路径

第二个参数为$_FILES 为你那个上传文件变量

第三个参数允许文件大小 单位为MB

第四个参数允许的文件类型 格式为jpg|png|gif

第五个参数是否需要生成新的文件名

第六个参数为返回的提示格式 0为直接提示上传正确 1则返回一个数组array('filename' => $filename, 'filesize' => $this->_filesize, 'tip' => UPLOAD_SUCCESS);

 ***/

//require("类文件");

//$u = new file_uploader;

//$u->ready($dir, $_FILES['upload_file'], false, false, true, 0);

//echo $u->do_upload();

?>

<form action="do.php" method="post" enctype="multipart/form-data">

    <input type="file" name="img">

    <input type="submit" value="上传文件">

</form>

<?php
header('content-type: text/html; charset=gb2312');

$dir = 'upload/';

require("up.php");

$u = new file_uploader;
$fname =time();
$u->ready($dir, $_FILES['img'], false, false, false, 0);

$url = $_FILES['img']['name'];
echo "请复制链接".$url;
echo $u->do_upload();