I have a little problem with programming.

I'm trying to make a website in which people could leave their humble opinions about each other.

I was looking into one page, http://numeris.info and they seem to use very simple but also very good which would suit my needs. basically, you type in after / number and it gives info about it from database, for ex :myawesomepage.co.uk/1234567890 I'm using Commentics review system if that helps. it fetches all data with identifier

$cmtx_identifier = 'x';

Is it possible somehow to fetch the digits from URL after slash and put them instead of x ? and, if the digit doesnt exist in system, is it possible to 'create' a page?

Sorry if its to many questions, I'm just trying to learn programming, and many thanks