DBPersister (database persistent library) is a PHP library which helps you simply and clearly use your database, taking advantage of powerful object oriented programming. You can use DBPersister to manage data from your database to your application. You can do all the boring operations (like loading a single record, saving a single record (insert, update, replace), and deleting a single record) without writing SQL code.
PHPContracts is a design by contract framework for the PHP programming language. It can be used in an object-oriented manner or with simple functions. Design by contract is a style of programming where classes and methods have a "contract" specified for them. If the contract is violated, then there is a defect/bug in the program.