PHP上传图片和文件

<?php

  header("Content-Type:text/html;charset=utf-8");

  if ((($_FILES["file"]["type"] == "image/gif") || ($_FILES["file"]["type"] == "image/jpeg") || ($_FILES["file"]["type"] == "image/jpg") || ($_FILES["file"]["type"] == "image/png") || ($_FILES["file"]["type"] == "image/bmp") || ($_FILES["file"]["type"] == "image/pjpeg")) && ($_FILES["file"]["size"] < 999999999))

    {

      if ($_FILES["file"]["error"] > 0)

      {

        echo "Return Code: " . $_FILES["file"]["error"] . "<br />";

      }

      else

      {

        echo "Upload: " . $_FILES["file"]["name"] . "<br />";

        echo "Type: " . $_FILES["file"]["type"] . "<br />";

        echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";

        echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br />";

        if (file_exists("upload/" . $_FILES["file"]["name"]))

        {

          echo $_FILES["file"]["name"] . " 已经存在. ";

        }

        else

        {

          move_uploaded_file($_FILES["file"]["tmp_name"], "upload/" . $_FILES["file"]["name"]);

          echo "Stored in: " . "upload/" . $_FILES["file"]["name"];

        }

      }

    }

  else

  {

    echo "无效文件";

  }

?>