$uptypes=array('image/jpg','image/jpeg','image/png','image/pjpeg','image/gif','image/bmp','application/x-shockwave-flash','image/x-png');
$max_file_size=5000000; //上传文件大小限制,单位BYTE

$addtime=date("Ymd",time());
$testdir="./".$addtime."/";
if(file_exists($testdir)):
else:
mkdir($testdir,0777);
endif;

$destination_folder=$addtime."/"; //上传文件路径
$imgpreview=1; //是否生成预览图(1为生成,其他为@R_301_481@);
$imgpreviewsize=1/2; //缩略图比例

if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
if (!is_uploaded_file($_FILES["Pic"][tmp_name]))
//是否存在文件
{
echo "文件不存在！";
exit;
}

$file = $_FILES["Pic"];
if($max_file_size < $file["size"])
//检查文件大小
{
echo "文件太大！";
exit;
}

if(!in_array($file["type"],$uptypes))
//检查文件类型
{
echo "只能上传图像文件或Flash！";
exit;
}

if(!file_exists($destination_folder))
mkdir($destination_folder);

$filename=$file["tmp_name"];
$image_size = getimagesize($filename);
$pinfo=pathinfo($file["name"]);
$ftype=$pinfo[extension];
$PicName = time().".".$ftype;
$destination = $destination_folder.$PicName;

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