Upgrading from PHP 5.3 to 5.5

Transcript

1. None

2. Glen Mailer

3. The Codebase

4. First commit April 2010
 60k commits since

5. 9300 PHP files
 690k lines of code According to git

   and cloc

6. 10 releases a week
 35 active committers
 10 concurrent streams


   1 deployable

7. The Platform

8. 8 Test Environments
 1 Staging Environment
 2 Live Environments

9. 74 Live PHP boxes

10. 1300 req/s peak
 500k uniques/week

11. Why?

12. Using basically the same PHP version as the first commit

    with security patches

13. PHP 5.3 is dead

14. Bug fixes
 Performance

15. New Features! short array syntax traits $this in closures yield

    finally

16. but no smoking gun

17. Bug #64827
 GC causes segfaults

18. The Plan

19. Upgrade a dev box
 Support 5.3 and 5.5
 Pass all

    tests
 Upgrade 1 Test env
 Upgrade CI
 Upgrade Test & Staging
 Incrementally Upgrade Live

20. Vagrant
 Chef
 Unit Tests
 Acceptance Tests

21. Hack hack hack...

22. 3 days later

23. What changed?

24. APC
 becomes
 OPcache and APCu

25. Check for new function, fall back to old one if

    (function_exists('opcache_reset')) { opcache_reset(); } else { apc_clear_cache(); }

26. “The PHP api will retain compatibility with APC, as will

    common configuration options, providing a drop in replacement.” APCu

27. Not a drop in replacement

28. APCu 4.0.1
 APCu 4.0.2

29. No more
 mysql_

30. It will not be missed

31. preg_replace /e
 becomes
 preg_replace_callback

32. (string) array()
 Now raises a warning Still returns “Array”

33. Type-checked function function inc($int) { if (!is_int($int)) { throw new

    InvalidArgumentException( 'Expected int, got: ' . $int ); } return $int + 1; }

34. Unit test for type-checked function /** * @dataprovider provideIncInvalid */

    function testIncRejectsInvalid($a) { try { inc($a); $this->fail('Expected exception'); } catch (InvalidArgumentException $ex) {} } function provideIncInvalid() { return array( null, true, "string", array() ); }

35. Simplest fix throw new InvalidArgumentException( 'Expected int, got: ' .

    json_encode($int) );

36. $a = "string”;
 $a['index'];
 Now raises a warning

37. // protected $a;
 ++$this->a
 Now raises a warning

38. Progress

39. Upgrade a dev box
 Support 5.3 and 5.5
 Pass all

    tests
 Upgrade 1 Test env
 Upgrade CI
 Upgrade Test & Staging
 Incrementally Upgrade Live

40. Upgrade a dev box
 Support 5.3 and 5.5
 Pass all

    tests
 Upgrade 1 Test env
 Upgrade CI
 Upgrade Test & Staging
 Incrementally Upgrade Live

41. What now?

42. Finish Migrating Live

43. See if the hard to reproduce failures have stopped

44. Start using new features!

45. Keep up to date

46. You should upgrade too!

47. Fin.

48. Questions?

49. @glenathan https://joind.in/9473