How can I set a default image if none is provided from form?

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PHP

Hi,

I have a form that allows you to upload an image (this is not mandatory). If the user does not upload an image I want it to set to a default image (default.jpg).

This is what I have:

$uploadDir = 'images/'; //Image Upload Folder
			if (isset($_POST['submit'])){
				$fileName = $_FILES['Photo']['name'];
				$tmpName  = $_FILES['Photo']['tmp_name'];
				$fileSize = $_FILES['Photo']['size'];
				$fileType = $_FILES['Photo']['type'];
				$filePath = $uploadDir . $fileName;
				$result = move_uploaded_file($tmpName, $filePath);

				if (!$result) {
					echo' An error occurred';
					exit();
				}
				if(!get_magic_quotes_gpc())
				{
					//addslashes adds a backslash before any malicious characters, for security
					$fileName = addslashes($fileName);
					$filePath = addslashes($filePath);
				};

The code above works fine with uploading an image, I just dont know how or where I can set it to default if none is provided. I have tried isset and empty but I keep getting the error from the if(!result) part.