用PHP实现图片上传到数据库

@session_start();

require_once("./conf/config.php");

$file_type = $_FILES["pic"]["type"];
$file_name = $_FILES["pic"]["name"];

if ((($file_type == "image/gif")
|| ($file_type == "image/jpeg")
|| ($file_type == "image/pjpeg"))
&& ($_FILES["pic"]["size"] < 1000000))
{

if(!is_dir("upload/". date("md") . "/"))
{
mkdir("upload/". date("md") . "/");
}
if (file_exists("upload/" . date("md") . "/" . $file_name))
{
echo "图片 " . $file_name . " 文件名已存在,请更换文件名再进行上传. ";
}
else
{
$url = "upload/" . date("md") . "/" .$file_name;
move_uploaded_file($_FILES["pic"]["tmp_name"],
"upload/" . date("md") . "/" . $file_name);
}
}

else
{
echo "图片文件不可用";
}

$userId = $_SESSION["userId"];

if($url){
$sql = "insert into photos(url, userId) values('$url', '$userId')";

$query = mysql_query($sql);
if($query){
die('');
}
}
?>