Summary: Discovering Potential OOP Backward-Compatibility Breaks

Key takeaways

• We learned about potential problems in OOP code when migrating to PHP 8. In the first lesson, we learned how a number of bad practices were allowed in PHP 7 and earlier versions but now represent a potential code break in PHP 8.

• We learned good habits when using magic methods. Potential code breaks can occur because PHP 8 now enforces a degree of consistency not seen in earlier versions of PHP. These inconsistencies involve class constructor usage and certain aspects of magic method usage.