The debug dance: An intro to step debugging - ZendCon & OpenEnterprise 2018

Talk given at ZendCon & OpenEnterprise (2018-10-16)

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.

Transcript

1. joind.in/talk/5fb02 @SammyK #zcoe18 Sammy Kaye Powers Dance The Las Vegas, NV - 2018 An Intro To Step Debugging in
2. joind.in/talk/5fb02 @SammyK #zcoe18 Download the slides joind.in/talk/5fb02
3. joind.in/talk/5fb02 @SammyK #zcoe18 Does not work for
4. joind.in/talk/5fb02 @SammyK #zcoe18 What is Debugging? Finding and fixing unexpected behavior in code
5. So you write Some Code
6. Does not work
7. joind.in/talk/5fb02 @SammyK #zcoe18 You could check the Error logs
8. joind.in/talk/5fb02 @SammyK #zcoe18 All the things var_dump()
9. joind.in/talk/5fb02 @SammyK #zcoe18
10. joind.in/talk/5fb02 @SammyK #zcoe18 OR
11. joind.in/talk/5fb02 @SammyK #zcoe18 Use a ‘er
12. joind.in/talk/5fb02 @SammyK #zcoe18 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++)
13. joind.in/talk/5fb02 @SammyK #zcoe18 …now is the perfect time to learn Step Debugging BNEW! Professional
14. joind.in/talk/5fb02 @SammyK #zcoe18 Some step-debugging Jargon
15. joind.in/talk/5fb02 @SammyK #zcoe18 a signal that tells the debugger to pause the execution of your code Breakpoint
16. joind.in/talk/5fb02 @SammyK #zcoe18 run to the next breakpoint Resume Program
17. joind.in/talk/5fb02 @SammyK #zcoe18 advance to the next line in the same scope Step Over
18. joind.in/talk/5fb02 @SammyK #zcoe18 if the next line is a function call, enter the function Step Into
19. joind.in/talk/5fb02 @SammyK #zcoe18 run to the end of the current function Step Out
20. joind.in/talk/5fb02 @SammyK #zcoe18 shows the execution path to the point where the code was paused Frames I… don’t have a cool drawing for “frames”…
21. joind.in/talk/5fb02 @SammyK #zcoe18 & Environment Setup
22. joind.in/talk/5fb02 @SammyK #zcoe18
23. joind.in/talk/5fb02 @SammyK #zcoe18 https://xdebug.org/docs/remote Debug client (DBGp protocol)
24. joind.in/talk/5fb02 @SammyK #zcoe18 Setup
25. #1 Start listening to debugging connections
26. #2 Set a Breakpoint
27. joind.in/talk/5fb02 @SammyK #zcoe18 Done!
28. joind.in/talk/5fb02 @SammyK #zcoe18 Setup
29. configured installed installed
30. on Homebrew Install + $ brew install php $ pecl install xdebug
31. on APT Install + $ add-apt-repository -y \ ppa:ondrej/php $ apt-get update $ apt-get install php7.2-xdebug
32. https://xdebug.org/docs/install Install +
34. joind.in/talk/5fb02 @SammyK #zcoe18 Configure
35. $ php --ini
36. $ php --ini
37. $ sudo vi /usr/local/etc/php/ 7.2/conf.d/ext-xdebug.ini
38. $ php -i | grep xdebug
39. joind.in/talk/5fb02 @SammyK #zcoe18 Start a session or CLI
40. joind.in/talk/5fb02 @SammyK #zcoe18 Query Param XDEBUG_SESSION_START
41. joind.in/talk/5fb02 @SammyK #zcoe18 Cookie XDEBUG_SESSION
42. joind.in/talk/5fb02 @SammyK #zcoe18
43. joind.in/talk/5fb02 @SammyK #zcoe18
44. joind.in/talk/5fb02 @SammyK #zcoe18 Env Variable export XDEBUG_CONFIG="idekey=foo" CLI
45. joind.in/talk/5fb02 @SammyK #zcoe18 Env Variable set XDEBUG_CONFIG="idekey=foo" CLI
46. joind.in/talk/5fb02 @SammyK #zcoe18 Don’t forget to unset set XDEBUG_CONFIG= unset XDEBUG_CONFIG when you’re done
47. joind.in/talk/5fb02 @SammyK #zcoe18 alias debug-on='export XDEBUG_CONFIG="ide_key=foo"' alias debug-off='unset XDEBUG_CONFIG' Bash alias
48. joind.in/talk/5fb02 @SammyK #zcoe18 Run some code! & CLI
49. joind.in/talk/5fb02 @SammyK #zcoe18 PHP’s Built-in Web Server run locally using
50. joind.in/talk/5fb02 @SammyK #zcoe18 Built right into the CLI SAPI! $ php -S 127.0.0.1:8888
51. joind.in/talk/5fb02 @SammyK #zcoe18
52. joind.in/talk/5fb02 @SammyK #zcoe18 learn? What did we
53. joind.in/talk/5fb02 @SammyK #zcoe18 +
54. joind.in/talk/5fb02 @SammyK #zcoe18
55. joind.in/talk/5fb02 @SammyK #zcoe18
56. joind.in/talk/5fb02 @SammyK #zcoe18 CLI
57. joind.in/talk/5fb02 @SammyK #zcoe18 Debugging In Action
58. joind.in/talk/5fb02 @SammyK #zcoe18
59. joind.in/talk/5fb02 @SammyK #zcoe18 In production
60. But wait! * (see me after class for more info)
61. Sammy Kaye Powers Thanks! /talk/5fb02 @SammyK SammyK.me Host of @PHPRoundtable