This slide was presented in WordCamp Nepal 2024, Pokhara, Nepal

1. Madan Panthi
Senior Software Engineer
Matat Technologies.
The Last Man Debugger
#WCNP2024
“I don’t use Debuggers,
I stare at the code until it confesses”

2. Steps of DebuggingThat I do

3. PHP Functions
Array ( [name] => John Doe [age] => 25 [height] => 5.9
[is_student] => 1 [grades] => Array ( [Math] => 90 [Science]
=> 85 [English] => 92 ) [hobbies] => Array ( [0] => Reading
[1] => Traveling [2] => Photography ) )

4. PHP Functions but beautiful

5. Debuggers?

6. Php Debug
Configuring the php.ini file

7. WP Debug
Configuring the
Now you can view errors on wp-content/debug.log
wp-config.php file

8. Understanding debug.log
[02-Jan-2024 10:31:39 UTC] PHP Fatal error: Uncaught Error: Failed opening required '/Users/manjul/Local
Sites/error_application/app/public/wp-content/themes/error_theme/inc/Matat_Customers/Customers.php'
(include_path='.:/usr/share/php:/www/wp-content/pear') in /Users/manjul/Local
Sites/error_application/app/public/wp-content/themes/error_theme/functions.php:203
Stack trace:
#0 /Users/manjul/Local Sites/error_application/app/public/wp-settings.php(611): include()
#1 /Users/manjul/Local Sites/error_application/app/public/wp-config.php(105):
require_once('/Users/manjul/L...')
#2 /Users/manjul/Local Sites/error_application/app/public/wp-load.php(50): require_once('/Users/manjul/L...')
#3 /Users/manjul/Local Sites/error_application/app/public/wp-blog-header.php(13):
require_once('/Users/manjul/L...')
#4 /Users/manjul/Local Sites/error_application/app/public/index.php(17): require('/Users/manjul/L...')
#5 {main}
thrown in /Users/manjul/Local Sites/error_application/app/public/wp-
content/themes/error_theme/functions.php on line 203

9. Understanding debug.log
[02-Jan-2024 10:31:39 UTC] PHP Fatal error: Uncaught Error: Failed opening required '/Users/manjul/Local
Sites/error_application/app/public/wp-content/themes/error_theme/inc/Customrs/Customers.php'
(include_path='.:/usr/share/php:/www/wp-content/pear') in /Users/manjul/Local
Sites/error_application/app/public/wp-content/themes/error_theme/functions.php:203
Stack trace:
#0 /Users/manjul/Local Sites/error_application/app/public/wp-settings.php(611): include()
#1 /Users/manjul/Local Sites/error_application/app/public/wp-config.php(105):
require_once('/Users/manjul/L...')
#2 /Users/manjul/Local Sites/error_application/app/public/wp-load.php(50): require_once('/Users/manjul/L...')
#3 /Users/manjul/Local Sites/error_application/app/public/wp-blog-header.php(13):
require_once('/Users/manjul/L...')
#4 /Users/manjul/Local Sites/error_application/app/public/index.php(17): require('/Users/manjul/L...')
#5 {main}
thrown in /Users/manjul/Local Sites/error_application/app/public/wp-
content/themes/error_theme/functions.php on line 203

10. Understanding debug.log
[02-Jan-2024 10:31:39 UTC] PHP Fatal error: Uncaught Error: Failed opening required '/Users/manjul/Local
Sites/error_application/app/public/wp-content/themes/error_theme/inc/Customrs/Customers.php'
(include_path='.:/usr/share/php:/www/wp-content/pear') in /Users/manjul/Local
Sites/error_application/app/public/wp-content/themes/error_theme/functions.php:203
Stack trace:
#0 /Users/manjul/Local Sites/error_application/app/public/wp-settings.php(611): include()
#1 /Users/manjul/Local Sites/error_application/app/public/wp-config.php(105):
require_once('/Users/manjul/L...')
#2 /Users/manjul/Local Sites/error_application/app/public/wp-load.php(50): require_once('/Users/manjul/L...')
#3 /Users/manjul/Local Sites/error_application/app/public/wp-blog-header.php(13):
require_once('/Users/manjul/L...')
#4 /Users/manjul/Local Sites/error_application/app/public/index.php(17): require('/Users/manjul/L...')
#5 {main}
thrown in /Users/manjul/Local Sites/error_application/app/public/wp-
content/themes/error_theme/functions.php on line 203

11. You are in production

12. You are in production

13. Debugging Plugins
• Query Monitor
• Debug Bar
• Health Check & Troubleshooting
• Ray

14. Query Monitor

15. Query Monitor

16. Query Monitor

17. Health Check & Troubleshooting

18. Ray

19. Madan Panthi
Senior Software Engineer
Matat Technologies.
Thank you!!!
#WCNP2024
The Last Man Debugger