/**
 * PHP限制上传文件类型并保存上传文件
 *
 * @param 
 * @arrange 512-笔记网： jb51.cc
 **/
<?PHP
$allowedExts = array("gif","jpeg","jpg","png");
$extension = end(explode(".",$_FILES["file"]["name"]));
if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/jpg")
|| ($_FILES["file"]["type"] == "image/pjpeg")
|| ($_FILES["file"]["type"] == "image/x-png")
|| ($_FILES["file"]["type"] == "image/png"))
&& ($_FILES["file"]["size"] < 20000)
&& in_array($extension,$allowedExts))
  {
  if ($_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 $_FILES["file"]["name"] . " already exists. ";
	  }
	else
	  {
	  move_uploaded_file($_FILES["file"]["tmp_name"],"upload/" . $_FILES["file"]["name"]);
	  echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
	  }
	}
  }
else
  {
  echo "Invalid file";
  }

/***   来自编程之家 jb51.cc（jb51.cc）   ***/