If you're looking for a shared host that won't stooge you I highly recommend HostGator. My company uses them for all our clients and we couldn't be happier.

Second for HostGator. We've had a couple of issues over the years, but they've been handled quickly and professionally.

If you want to have a support ticket escalated to Brent (President of the company) you just ask, and it actually happens. He spent a week emailing with me when we were having some downtime issues this August.

No host is perfect, but HostGator customer support is awesome, the QoS is good, and the pricing is fair. That's all I can ask for.

Thanks they look great.

Of course! I'm happy to give them the business given how well they've treated me. I've been using them for almost 5 years now with absolutely no serious issues! I don't think there's too many affordable hosts out there these days that are like that.

(edit: I can't recommend them for Rails though. They will hosts Rails apps, but only via a CGI interface which is crazy slow. If you're ever looking for a good Rails host try http://www.blueboxgrp.com/)

Shared host-wise, WebFaction is the shit. The guys who run it are awesome.

http://webfaction.com

you said this is written in PHP -- if you don't have access to your php.ini file, you can put

  error_reporting(0);

at the top of the script to prevent warnings from showing up to the user.

Are you interested in releasing the code? :)