Exception Handling in PHP

Transcript

1. try { Exception Handling in PHP } A brief introduction

2. Exception != Error

3. – docs.oracle.com “An exception is an event, which occurs during

   the execution of a program, that disrupts the normal flow of the program's instructions.”

4. – php.net/manual “When an exception is thrown, code following the

   statement will not be executed, and PHP will attempt to find the first matching catch block. If an exception is not caught, a PHP Fatal Error will be issued with an "Uncaught Exception ..." message”

5. Application Layers Presentation Business Data NoDatabaseConnectionException NoResultException EmptyResultException InvalidConfigurationException HTTP/404

   HTTP/500

6. Example EVIL!

7. – Me “Because a DBAL does not know how to

   handle an empty result… But the business logic does!”

8. Done right

9. Done right

10. Pass Exceptions through layers

11. Exceptions

12. DBAL

13. Repository

14. Controller

15. – OSS Development Wisdom “An API method should always return

    an expected result or throw an exception.”

16. Thanks ;) frankneff.ch - @frank_neff - github.com/frne