File Upload in PHP with Example

if (($_FILES["file"]["type"] == "image/gif") ($_FILES["file"]["type"] == "image/jpeg") ($_FILES["file"]["type"] == "image/pjpeg")&& ($_FILES["file"]["size"] <> 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";
}