Debugging WordPress Core and Plugins!
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This document discusses debugging techniques for WordPress core and plugins. It introduces the presenter and explains why debugging is important. It then outlines some quick debugging techniques using WordPress constants and functions like var_dump(). It notes potential issues with only using constants and introduces the Chassis virtual machine for WordPress development. Finally, it discusses useful WordPress debugging plugins like Debug Bar and Query Monitor and the Xdebug PHP extension.
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Debugging WordPress Core and Plugins!
- 1. Debugging WordPress Core & Plugins! @bronsonquick
- 2. Overview @bronsonquick ● Who Am I? ● Why Debugging Is Important ● Quick Debugging Wins ● WordPress Constants For Debugging ● Issues With Constants ● Chassis ● WordPress Plugins For Debugging ● Query Monitor ● Interactive Debugging ● Xdebug
- 3. Who Am I? @bronsonquick ● Senior WordPress Developer ● Core Contributor ● Occasional WordPress Podcaster - WP Dev Table ● Maintainer Of Chassis ● Occasional WordCamp Organiser - WordCamp Gold Coast & WordCamp Brisbane ● Massive Smashing Pumpkins Fan ● Vinyl Addict ● Guitar Fan
- 7. define( ‘WP_DEBUG’, true ); @bronsonquick
- 8. define( ‘WP_DEBUG_LOG’, true ); debug.log @bronsonquick
- 9. define( ‘SCRIPT_DEBUG’, true ); WordPress will use the "dev" versions of core CSS and JavaScript files rather than the minified versions. @bronsonquick
- 10. define( ‘SAVEQUERIES’, true ); Saves the database queries to an array and that array can be displayed to help analyze those queries. @bronsonquick
- 11. var_dump( $wcsc2016 ); echo( $wcsc2016 ); @bronsonquick
- 12. Issues With That Approach @bronsonquick ● z-index issues - WordPress admin & themes ● Admin Ajax calls ● XML-RPC ● Cron jobs ● RSS Feeds ● REST API ● ….
- 13. Chassis @bronsonquick ● Chassis - A Virtual Machine For WordPress Development https://github.com/Chassis/Chassis/ ● Docs - http://chassis.io/ ● VirtualBox - https://www.virtualbox.org/ ● Vagrant - https://www.vagrantup.com/ ● Zeroconf networking (Bonjour)
- 15. Improving Debugging With Plugins @bronsonquick ● Debug Bar - https://wordpress.org/plugins/debug-bar/ ● Debug Bar Extender - https://wordpress.org/plugins/debug-bar-extender/ ● Debug Bar Cron - https://wordpress.org/plugins/debug-bar-cron/ ● Debug Bar Transients - https://wordpress.org/plugins/debug-bar-transients/ ● Log Deprecated Notices - https://wordpress.org/plugins/log-deprecated-notices/ ● Rewrite Rules Inspector - https://wordpress.org/support/view/plugin-reviews/rewrite-rules- inspector/ ● Developer - https://wordpress.org/plugins/developer/
- 17. Query Monitor @bronsonquick ● Query Monitor - https://wordpress.org/plugins/query-monitor/ ● Query, Caller, Component Function - Core, Plugin & Theme ● HTTP Requests.. ● Hooks & Actions That Are Fired ● HTTP Header Added - X-QM-Redirect-Trace ● Ajax Debugging (jQuery) - Clickable stack trace in your console ● Number Queries Performed, Slow Queries, Queries with errors, Memory Usage, Time Taken, PHP Version, MySQL versions, Request Parameters, Clickable Stack Traces ● REST API Debugging
- 19. Xdebug @bronsonquick ● Xdebug Extension For Chassis - https://github.com/Chassis/Xdebug/ ● PHPStorm ● Variable Inspection ● Set Breakpoints ● Step Into, Step Over ● Watches