PHP下传文件

if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/pjpeg"))
&& ($_FILES["file"]["size"] < 20000))
? {
? if ($_FILES["file"]["error"] > 0)
??? {
??? echo "Return Code: " . $_FILES["file"]["error"] . "
";
??? }
? else
??? {
??? echo "Upload: " . $_FILES["file"]["name"] . "
";
??? echo "Type: " . $_FILES["file"]["type"] . "
";
??? echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb
";
??? echo "Temp file: " . $_FILES["file"]["tmp_name"] . "
";

??? 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";
? }
?>