This new minor version brings with it a number of new features and a few incompatibilities that should be tested for before switching PHP versions in production environments.
Siehe auch die Migrationsleitfäden für PHP-Versionen 5.0.x, 5.1.x, 5.2.x, 5.3.x, 5.4.x, 5.5.x, 5.6.x, 7.0.x and 7.1.x.