Is there any drop shadow plugin for jquery?
Seems there was but is no more...
Any help?
Also, is it possible to use jquery in a PHP file ? (I create a table in the php file)
You correctly summed up the current state. There used to be a jQuery UI drop shadow component, but not any more.
If you're looking for any way to create drop shadows, just Google for "CSS drop shadow" and you'll find tons of results.
Edit: Yes, you can use jQuery in a PHP file, or pretty much any other server-side scripting language. I recommend writing your Javascript in a separate foo.js file and importing it.
In the future, please ask a new question instead of editing, if the topic isn't directly related.