Web-based equivalent of OpenOffice.org Base or Microsoft Access?

I've currently been using Base/MS Access to create forms etc. that interface with a backend database, to save me writing a backend in PHP. Downside is that it only runs on the desktop. Is anyone aware of any web-based equivalent?

Edit: Should have done more research, I need it t开发者_运维技巧o interact with MySQL, not an Access DB.

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Have you considered Access 2010 : Hosting an Access DB

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Depending on Access version, you could use Data Access Pages (Can be used with Access 2007+ with some additional work.). The recommended usage for 2007+ would be within SharePoint.