Help with php xml parsing

[ali_p]

Hi, I'm working of writing an RSS feed with php and XML. So far I have the following;

while($row = mysql_fetch_array($result))
		{
			$items .= '<item>
						 <title>'. $row["title"] .'</title>
						 <link>'. $row["link"] .'</link>
						 <description><![CDATA['. $row["description"] .']]></description>
						 <enclosure url="video/' . $row["media_file"] .'" />
					 </item>';
		}

I have come a little stuck with how to output the RSS enclosure tag can anyone advice me on how to do this please. I have this;

<enclosure url="video/' . $row["media_file"] .'" ';
    ' length="'. $row["length"].'" ';
    ' type="'. $row["type"] .'" />

But I am getting errors. Thanks in advance