In a new post to his blog Martin Psinas talks about some of his pains experienced with upgrading his code to use PDO instead of the mysql extension for database interaction.

I read not too long ago that the mysql library in PHP is being deprecated as of v6.0 in favor of mysqli or PDO, so of course I had to update all of my database code keep on top of things. I spent about 5 or 6 hours over the course of 2 days familiarizing myself with the new syntax and updating my code offline. Without any testing, I decided I could go ahead and push the code "live" because I'm just that over-confident sometimes, although I did make a backup in case anything went wrong (or so I thought).

Two problems jumped out immediately - a SQL error caused by this bug and the other being a problem with preparing his statement inside of a session handling method.