PHP 5.6 is currently being tested, and the features and changes noted in this section are subject to change before the final 5.6.0 release. Please double check this migration guide before deploying a stable 5.6 release to production.
Most improvements in PHP 5.6.x have no impact on existing code. There are a few incompatibilities and new features that should be considered, and code should be tested before switching PHP versions in production environments.
Смотрите также руководство по миграции для версий PHP 5.0.x, 5.1.x, 5.2.x, 5.3.x, 5.4.x and 5.5.x.