Symfony Components
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Symfony Components are part of the Symfony Framework and they are designed as decoupled and reusable PHP components.
Their use cases vary from simple little helpers such as a beautified var_dump to more complex ones such as access control, list-based security mechanisms and an easy-to-integrate console component to give your already existing applications some CLI capabilities. They are used by a lot of PHP-based projects such as Typo3, Magento, Composer, PHPUnit and Doctrine, with contributions continually taking place. If you are planning the next project with PHP components, you should have a look at the Symfony Components list, which includes a lot of well-designed, decoupled Open Source pieces of PHP code.