The Debug Dance - An Intro To Step Debugging - Chicago PHP UG

This talk was presented at the Chicago PHP UG meetup on March 27th, 2017: https://www.meetup.com/Chicago-PHP-User-Group/events/237220317/

Transcript

1. Sammy Kaye Powers An Intro To Step Debugging in Dance The Chicago PHP UG March 27th, 2017
2. Does not work for
3. What is Debugging? Finding and fixing of unexpected behavior in code
4. So you write Some Code
5. Does not work
6. You could check the Error logs
7. All the things var_dump()
9. OR
10. Use a ‘er
11. 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++)
12. …now is the perfect time to learn Step Debugging BNEW! Professional
13. Some step-debugging Jargon
14. a signal that tells the debugger to pause the execution of your code Breakpoint
15. run to the next breakpoint Resume Program
16. if the next line is a function call, enter the function Step Into
17. run to the end of the current function Step Out
18. advance to the next line in the same scope Step Over
19. a live portal into the code execution process Debugging Console
20. shows the execution path to the point where the code was paused Frames I… don’t have a cool drawing for “frames”…
21. & Environment Setup
22. Setup
23. #1 Start listening to debugging connections
24. #2 Set a Breakpoint
25. Done!
26. Setup
27. configured installed installed
28. $ brew tap homebrew/homebrew-php $ brew install php71 $ brew install php71-xdebug on Homebrew Install +
29. $ add-apt-repository -y ppa:ondrej/php $ apt-get update $ apt-get install php7.1-xdebug on APT Install +
30. https://xdebug.org/docs/install Install +
32. Configure
33. $ php --ini
34. $ sudo vi /usr/local/etc/php/ 7.1/conf.d/ext-xdebug.ini
35. $ php -i | grep xdebug
36. Start a session or CLI
37. Query Param XDEBUG_SESSION_START
38. Cookie XDEBUG_SESSION
42. Env Variable export XDEBUG_CONFIG="idekey=foo" CLI
43. Env Variable set XDEBUG_CONFIG="idekey=foo" CLI
44. Don’t forget to unset set XDEBUG_CONFIG= unset XDEBUG_CONFIG when you’re done
45. Run some code! & CLI
46. PHP’s Built-in Web Server run locally using
47. Built right into the CLI SAPI! $ php -S 127.0.0.1:8888
48. But! if we have time, we’ll also use &