Check availability of a video or audio stream using PHP

I'd like to know if anyone knows how to check (using PHP) if
a video or audio live broadcast is available. Right now my church
uses Playstream to host the streaming audio for our church
services. Being the webmaster I thought it would be cool if I could
check if the wvx feed is active and then have that dynamically
change the link (either "Check back later" or "Live now!"). I'm
fairly proficient with PHP but I don't know how to do this.
Using DW7 if that makes a diff.
Thanks in advance!

Nbc app is streaming the video from their server, if they don't provide a way to do it in their app than you can't do it.

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