Why PHP 9.0 Is Switching to the 3‑Clause BSD License
The php.internals vote on April 4 approved moving PHP 9.0 to the permissive 3‑clause BSD license, replacing the dual PHP v3.01 and Zend Engine licenses, and the article explains the historical reasons, legal benefits, comparisons with other BSD variants, PostgreSQL’s approach, and broader open‑source licensing trends.
