我的php的学习

<?
class upload{
private $name;                 //$_FILES['file'][name]
private $type;                 //$_FILES['file'][type]
private $tmp_name;             //$_FILES['file'][tmp_name]
private $error;                //$_FILES['file'][error]
private $size;                 //$_FILES['file'][size]
private $newf;                 //文件上传路径 默认为  upload/
 public function __construct($name,$type,$tmp_name,$error,$size,$newf="upload/"){
 $this->name=$name;
 $this->type=$type;
 $this->tmp_name=$tmp_name;
 $this->error=$error;
 $this->size=$size;
 $this->newf=$newf;
 }
 private function size(){      //上传大小
  if($this->size>(1024*1024)){ //默认为 1MB
  echo "<script>alert('您上传文件太大了,不能上传！');history.back();</script>";
  
  exit();
  }
 }
 private function type(){ //支持上传类型
  switch    ($this->type)
  {
  case    "image/pjpeg":
  break;
  case    "image/gif":
  break;
  case    "image/x-png":
  break;
  case    "application/x-shockwave-flash":  //swf
  break;
  case    "text/plain": //text
  break;
  case    "application/msword": //doc
  break;
&nb