一个完美php文件上传类使用实例_PHP教程

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();

?>

$dir = 'upload/';
require("upload_class.php");
$u = new file_uploader;
$u->ready($dir, $_FILES['upload_file'], false, false, true, 0);
echo $u->do_upload();