Anyone validating URLS passed to your app???

[eluser]Référencement Google[/eluser]
I don't really see the need of doing this.

First of, accessing an edit post url should be only possible in a secured environement, only once the user is already logged in.

Then what I usually do too is unsure the edited post belongs to the concerned user by querying the DB with the logged in user ID before letting him edit. I additionally unsure the ID is numerical and exists in the post table. With all that I am almost sure I won't have problems.