How can I take user input and append it to a url?

[cyberhost]

Hello,

 

Firstly I am only just learning php so please bear with me.

 

What I want to be able to do is for a user to be able to enter a youtube url eg:

http://www.youtube.com/watch?v=8xz7ShMCWls

 

I want the scrip to take the video ID (after watch?v=) and append it into a html embed code for our forums that do not have the feature to auto embed a youtube vid.

 

<p> <img height="350" width="425" class="fw_media_youtube fw-parse" alt="YouTube-AFTER WATCH?V=CODE" src="http://thumbs.webs.com/Platform/mediaPreview.jsp?type=YouTube&id=AFTER WATCH?V=CODE"/></p>

 

Where you see AFTER WATCH?V=CODE is where I want it to place the video id and then return this completed code for the user to copy and paste:

 

<p> <img height="350" width="425" class="fw_media_youtube fw-parse" alt="YouTube-8xz7ShMCWls" src="http://thumbs.webs.com/Platform/mediaPreview.jsp?type=YouTube&id=8xz7ShMCWls"/></p>

 

How would I be able to get this done. I do not expect to be spoon fed but just a litlle help please.

 

Thank you so much if you do help.

[QuickOldCar]

http://www.phpfreaks.com/forums/index.php?topic=342974.msg1618361#msg1618361

[cyberhost]

http://www.phpfreaks.com/forums/index.php?topic=342974.msg1618361#msg1618361

 

Thank you VERY much

[cyberhost]

Sorry for double post however that script does not include user input. I mean the basis of the script is great and would work. But my problem is I do not know how to take it from the user inputting the url to it dynamically creating the embed code. That script has the video urls already placed in it.