php文件上传（强大文件图片上传类）这款文件上传实用代码，可以方便的上传你指定的文件或图片，同时也可以快速的限制上传图片文件类或大小。

php教程php教程（强大文件php教程类）
这款文件上传实用代码，可以方便的上传你指定的文件或图片，同时也可以快速的限制上传图片文件类或大小。

/*
 * created on 2010-6-21
 *
 * the class for image to upload
 *
 * made by s71ence
 *
 * @$user_id
 * @$max_file_size
 * @$max_image_side
 * @$destination_folder
 *
 * return:
 * @$_cookie[img_path]
 * @$img_unfind
 * @$img_type
 * @$mkdir_warry
 * @$img_side_too_big
 * @$img_exist
 * @$img_move
 * @$img_upload_sucess
 */
 

header(content-type:text/html;charset=utf-8);
 
 class image_upload extends fn_function
 {
 private $user_id;
 private $max_file_size; //allow the images size
 private $max_image_side; //allow the images side
 private $destination_folder; //images storage path
 private $img_preview;
 private $img_preview_size;
 private $cookie_set; //the cookies name

 function __construct($user_id,$max_file_size,$max_image_side,$destination_folder,$img_preview,$img_preview_size,$cookie_set)
 {
  $this->user_id=$user_id;
  $this->max_file_size=$max_file_size;
  $this->max_image_side=$max_image_side;
  $this->destination_folder=$destination_folder;
  $this->img_preview=$img_preview;
  $this->img_preview_size=$img_preview_size;
  $this->cookie_set=$cookie_set;
  $this->get_date();
  $this->get_image_type();
 }

 private function get_date()
 {
  $this->date=fn_function::get_server_date();
  return $this->date;
 }

 function get_image_type()
 {
  $this->up_img_types=array(
            image/jpg,
            image/jpeg,
            image/png,
            image/pjpeg,
            image/gif,
            image/bmp,
            image/x-png
        );

  return $this->up_img_types;
 }

 function upload_image()
 {
  if ($_server[request_method] == post)
  {
   //check the iamge is exist
   if (!is_uploaded_file($_files["upfile"]["tmp_name"]))
   {
    return $img_unfind=fn_function::alert_msg(图片不存在!);
    exit;
      }

      $file = $_files["upfile"];

   //check the iamges size
      if($this->max_file_size < $file["size"])
      {
       return $img_side_too_big=fn_function::alert_msg(图片大小超过系统允许最大值!);
       exit;
      }

      //check the iamges type
      if(!in_array($file["type"], $this->up_img_types))
      {
       return $img_type=fn_function::alert_msg(图片类型不符!);
       exit;
      }

      if(!file_exists($this->destination_folder))
      {
       if(!fn_function::mkdirs($this->destination_folder))
       {
        return $mkdir_warry=fn_function::alert_msg(目录创建失败!);
        exit;
       }
      }

      $file_name=$file["tmp_name"];
      $image_size = getimagesize($file_name);
      $pinfo=pathinfo($file["name"]);
      $file_type=$pinfo[extension];
      $destination = $this->destination_folder.time().".".$file_type;
   setcookie($this->cookie_set, $destination);

   if($image_size[0]>$this->max_image_side || $image_size[1]>$this->max_image_side)
   {
    return $img_side_too_big=fn_function::alert_msg(图片分辨率超过系统允许最大值!);
    exit;
   }

   $overwrite="";
   if (file_exists($destination) && $overwrite != true)
   {
    return $img_exist=fn_function::alert_msg(同名文件已经存在了!);
    exit;
      }

      if(!move_uploaded_file ($file_name, $destination))
      {
       return $img_move=fn_function::alert_msg(移动文件出错!);
       exit;
      }

   $img_upload_sucess="<font color=red face=微软雅黑>上传成功</font><br>";
   if($this->img_preview==1)
   {
    $img_src="<img src="".$destination."" width=".($image_size[0]*$this->img_preview_size)." height=".($image_size[1]*$this->img_preview_size);
    $img_upload_sucess.=$img_src;
   }
      return $img_upload_sucess;
  }
 }

 function __destruct()
 {
  //clear
 }
 }

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