PHP上传类，分享给大家，不足之处请见谅！

/*
*
* 文件上传类 kangyangyang 2010-06-07
* $loadfile 要上传的文件的文件域
* $loadpath 文件存放路径
* $loadhold 保留文件原名
* $loadsize 文件大小限制 //默认是2048KB
* $loadtype 文件类型限制 //默认支持 jpg|jpeg|gif|png|txt|rar|zip
*
*/
class uploadfile{
private $loadfile;
private $loadpath;
private $loadsize;
private $loadtype;
private $loadhold = false;
private $chkfile = true;
private $file_name;
private $extend_type;
private $set_name;
private $set_size;
private $set_path;
private $set_create_name;
private $get_error;
//构造函数
function __construct($loadfile,$loadpath,$loadhold = false,$loadsize="2097152",$loadtype="jpg|jpeg|gif|png|txt|rar|zip"){
   $this->loadfile = $loadfile;
   $this->loadpath = $loadpath;
   $this->loadsize = $loadsize;
   $this->loadtype = $loadtype;
   $this->loadhold = $loadhold;
   $this->filecheck();
}
//文件上传
function filecheck(){
  $filename = $_FILES[$this->loadfile]['name']; //文件名
  $filetype = $_FILES[$this->loadfile]['type']; //文件类型
  $filesize = $_FILES[$this->loadfile]['size']; //文件大小
  $filepath = $_FILES[$this->loadfile]['tmp_name']; //临时文件
  $fileerror= $_FILES[$this->loadfile]['error']; //错误代码
  if($fileerror <= 0 && $filename != ""){
   if($this->loadsize >= $filesize){
    $this->set_size = $filesize;
    $ext = explode(".",$filename);
    $this->set_name = $ext;
    $ext_type = strtolower($ext[count($ext)-1]);
    $this->extend_type = $ext_type;
    $chk_type = explode("|",$this->loadtype);
    if(in_array($ext_type,$chk_type)){
     $f_path = $this->get_folder();
     $this->set_create_name = $createname = time().rand(1,9999);
     $this->file_name = $createname.".".$ext_type;
     if($this->loadhold){
      $file_path = $f_path.$filename;
      $this->set_path = $file_path;
     }else{
      $file_path = $f_path.$this->file_name;
      $this->set_path = $file_path;
     }
     $ckfile = move_uploaded_file($filepath,$file_path);
     if(!$ckfile){
      $this->chefile = false;
     }
    }else{
     $this->chkfile = false;
    }
   }else{
    $this->chkfile = false;
   }
  }else{
   $this->chkfile = false;
   $this->get_error = $fileerror;
  }
}
//生成的文件名
function get_CreateName(){
  if($this->CheckFile()){
   if(!$this->loadhold){
    return $this->set_create_name;
   }
  }
}
//返回文件夹路径
function get_folder(){
  if($this->CheckFile()){
   if(!file_exists($this->loadpath)){
    mkdir($this->loadpath,0777,true);
    chmod($this->loadpath,0777);
   }
   return $this->loadpath;
  }
}
//文件扩展名
function get_type(){
  if($this->CheckFile()){
   return $this->extend_type;
  }
}
//文件名"不包括扩展名"
function get_name(){
  if($this->CheckFile()){
   $filename = $this->set_name;
   unset($filename[count($filename)-1]);
   return implode(".",$filename);
  }
}
//返回文件大小
function get_size(){
  if($this->CheckFile()){
   return $this->set_size;
  }
}
//返回文件全路径
function get_path(){
  if($this->CheckFile()){
   return  $this->set_path;
  }
}
//文件是否上传成功
function CheckFile(){
  return $this->chkfile;
}
//获取错误代码
function get_error(){
  if($this->CheckFile()){
   return $this->get_error;
  }
}
}