I have to develop a simple web-based data entry/editing tool - something which would allow me to stay away from MS Access for that task. Preferrably in PHP then one that might be support SQLite, foreign secrets/references and area validation.

I have checked out the demos of Symfony and wasn't impressed using the interface ultimately. Are there more frameworks/tools that may work with this?

Although not specifically web-based you could look at:

http://www.sqliteexpert.com/

I'd plug my very own dynamic database Content management systems system, but I've got a feeling you'd take some modifications for what you would like. Any reason speicifically you'll need SQLite rather than mySQL?

Here you go just just in case... UltraPanel PRO

The only real ones I understand of are:

There to not attractive however they may go for what you would like.