Need some help with forms and mysql

I have a registration form which new users fill in some basic iinformation and when it is submitted the appropriate tables in mysql database are updated. Is there a way for when the user enters their webpage url to append to the beginning and end of what they submit either in the form itself, the php page it calls on or mysql?

For example when they enter http://www.myhomepage.com I would like it pushed to the table as