The Debug Dance - An Intro to Step Debugging - php[tek] 2017

This talk was given at php[tek] 2017.

Using `var_dump()` to debug your app has its benefits, but there are more comprehensive and efficient ways to debug those particularly elusive bugs. Enter step debugging. We’ll be using the PhpStorm IDE to step through our PHP apps line by line and see how much more power step debugging gives us over the conventional `var_dump()` technique. We'll also touch on debugging from the command line. Learn to dance in PHP with step debugging.

Code examples: https://github.com/SammyK/debug-dance-php-tek-2017

Transcript

1. joind.in/talk/a2b9a @SammyK #phptek Sammy Kaye Powers Dance The May 26th, 2017 PHP[TEK] 2017 An Intro To Step Debugging in
2. Thanks to our Sponsors!
3. joind.in/talk/a2b9a @SammyK #phptek Download the examples & slides joind.in/talk/a2b9a
4. joind.in/talk/a2b9a @SammyK #phptek Does not work for
5. joind.in/talk/a2b9a @SammyK #phptek What is Debugging? Finding and fixing unexpected behavior in code
6. So you write Some Code
7. Does not work
8. joind.in/talk/a2b9a @SammyK #phptek You could check the Error logs
9. joind.in/talk/a2b9a @SammyK #phptek All the things var_dump()
10. joind.in/talk/a2b9a @SammyK #phptek
11. joind.in/talk/a2b9a @SammyK #phptek OR
12. joind.in/talk/a2b9a @SammyK #phptek Use a ‘er
13. joind.in/talk/a2b9a @SammyK #phptek Kate Gregory “ I'm not saying, ‘don't use printf()’, [...] but I think it's insane to use printf() on day one of learning C++. [...] I would first say use the debugger. Episode 30: Stop Teaching C (When Teaching C++)
14. joind.in/talk/a2b9a @SammyK #phptek …now is the perfect time to learn Step Debugging BNEW! Professional
15. joind.in/talk/a2b9a @SammyK #phptek Some step-debugging Jargon
16. joind.in/talk/a2b9a @SammyK #phptek a signal that tells the debugger to pause the execution of your code Breakpoint
17. joind.in/talk/a2b9a @SammyK #phptek run to the next breakpoint Resume Program
18. joind.in/talk/a2b9a @SammyK #phptek advance to the next line in the same scope Step Over
19. joind.in/talk/a2b9a @SammyK #phptek if the next line is a function call, enter the function Step Into
20. joind.in/talk/a2b9a @SammyK #phptek run to the end of the current function Step Out
21. joind.in/talk/a2b9a @SammyK #phptek a live portal into the code execution process Debugging Console
22. joind.in/talk/a2b9a @SammyK #phptek shows the execution path to the point where the code was paused Frames I… don’t have a cool drawing for “frames”…
23. joind.in/talk/a2b9a @SammyK #phptek & Environment Setup
24. joind.in/talk/a2b9a @SammyK #phptek Setup
25. #1 Start listening to debugging connections
26. #2 Set a Breakpoint
27. joind.in/talk/a2b9a @SammyK #phptek Done!
28. joind.in/talk/a2b9a @SammyK #phptek Setup
29. configured installed installed
30. $ brew tap homebrew/homebrew-php $ brew install php71 $ brew install php71-xdebug on Homebrew Install +
31. $ add-apt-repository -y ppa:ondrej/php $ apt-get update $ apt-get install php7.1-xdebug on APT Install +
32. https://xdebug.org/docs/install Install +
34. joind.in/talk/a2b9a @SammyK #phptek Configure
35. $ php --ini
36. $ sudo vi /usr/local/etc/php/ 7.1/conf.d/ext-xdebug.ini
37. $ php -i | grep xdebug
38. joind.in/talk/a2b9a @SammyK #phptek Start a session or CLI
39. joind.in/talk/a2b9a @SammyK #phptek Query Param XDEBUG_SESSION_START
40. joind.in/talk/a2b9a @SammyK #phptek Cookie XDEBUG_SESSION
41. joind.in/talk/a2b9a @SammyK #phptek
42. joind.in/talk/a2b9a @SammyK #phptek
43. joind.in/talk/a2b9a @SammyK #phptek Env Variable export XDEBUG_CONFIG="idekey=foo" CLI
44. joind.in/talk/a2b9a @SammyK #phptek Env Variable set XDEBUG_CONFIG="idekey=foo" CLI
45. joind.in/talk/a2b9a @SammyK #phptek Don’t forget to unset set XDEBUG_CONFIG= unset XDEBUG_CONFIG when you’re done
46. joind.in/talk/a2b9a @SammyK #phptek Run some code! & CLI
47. joind.in/talk/a2b9a @SammyK #phptek PHP’s Built-in Web Server run locally using
48. joind.in/talk/a2b9a @SammyK #phptek Built right into the CLI SAPI! $ php -S 127.0.0.1:8888
49. joind.in/talk/a2b9a @SammyK #phptek
50. joind.in/talk/a2b9a @SammyK #phptek learn? What did we
51. joind.in/talk/a2b9a @SammyK #phptek +
52. joind.in/talk/a2b9a @SammyK #phptek
53. joind.in/talk/a2b9a @SammyK #phptek
54. joind.in/talk/a2b9a @SammyK #phptek CLI
55. joind.in/talk/a2b9a @SammyK #phptek Debugging In Action
56. joind.in/talk/a2b9a @SammyK #phptek
57. joind.in/talk/a2b9a @SammyK #phptek In production
58. But wait! I have examples of other setups! & * (see me after class for more info)
59. THANKS! SAMMY KAYE POWERS @SammyK SammyK.me Host of @PHPRoundtable @ChiPHPUG West Coast Swing Hire me! :) /talk/a2b9a I have stickers!