PHP文件上传

<?php
  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 />";
	$uploaddir = "D:/xampp/htdocs/upload/files/";
	$uploadfile = $uploaddir . $_FILES["file"]["name"];

    if (file_exists($uploadfile )){
		echo $_FILES["file"]["name"] . " already exists. ";
	}else{
		move_uploaded_file($_FILES["file"]["tmp_name"],$uploadfile);
		echo "Stored in: " . $uploadfile;
      }
    }
?>