I just did the same thing and I used this link
http://codex.wordpress.org/Changing_The_Site_URL
to set it back to what it was, so I could get into the wp-admin again.
I used the FTP directions. I dont know if this will help, but doesn’t hurt to try!
Thread Starter
hakuhn
(@hakuhn)
thank you! (how do you update your php, or is that not something I can do?)