Need bytes (filesize) for podcast MP3 upload

Hello!

We are creating an RSS file for an iTunes compatible podcast. It pulls info from CMS Builder inputted info for Title, Description, Upload, etc. Everything is working beautifully with one exception. (But, we know someone here will have the solution!) :-)

For each item, there is a necessary tag called "enclosure". One of its attributes is "length". This length attribute is needing a positive number indicating the total number of bytes that the uploaded MP3 file is.

I have tried accessing this with PHP's "filesize" function and CMS Builder's "urlPath" variable. But, that was resulting in a relative URL, when an absolute URL is required. So, I tried using the period to concatenate the missing domain root portion of the URL to the relative database stuff. Good idea, but does not work for some reason. (Though I was successful with this approach when supplying an absolute URL for the aforementioned "enclosure" tag's URL attribute.) And, I've tried using a variable with "filesize" which was a concatenation of the URL pieces, also with no success.

Unfortunately, using my very limited PHP knowledge, I have not been able to figure out a way to supply the number of bytes of the uploaded MP3 to this "length" attribute. Does anyone have any suggestions? (I hope...) :-)

Here's an example of what the output should look like:

<enclosure
url="http://www.mydomain.com/audio/uploads/file.mp3"
length="3336636"
type="audio/mpeg"
/>


Thanks, in advance, for any assistance.


Kindest regards,
Jeremy