Domain-Driven Design in PHP

PEAR-Style Namespacing

Before PHP 5.3, due to the lack of a namespace construction, PEAR-style namespaces were used. PEAR is an acronym for PHP Extension and Application Repository, and in the good old days, it was a Repository of reusable components. It's still active, but it's not very convenient, and not many people use it anymore — particularly since Composer and Packagist were introduced. PEAR, as a source of reusable components, needed a way to avoid class name collisions, so contributors started prefixing class names with namespaces. There are still projects that use this form of namespaces (PHPUnit and Zend Framework 1, to name a couple). An example of PEAR-style namespaces:

The following would be an example of PEAR-style namespaces: ...