HOW TO DEBUG WORDPRESS

If you develop with wordpress.org code you should be doing this.

• Open your wp-config.php
• Put this in it

define('WP_DEBUG', true);
define('SAVEQUERIES', true);
define('SCRIPT_DEBUG', true);

Now go download this: http://wordpress.org/extend/plugins/debug-bar/

Make sure you enable the admin bar under Users–> YOU —>  “Show Toolbar when viewing site” (do not do this on a live site).

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Want More?

• Install the debug bar extender: http://wordpress.org/extend/plugins/debug-bar-extender/
• Install xdebug: http://xdebug.org/
• Configure error logging

Read:

• http://www.slideshare.net/andrewnacin/wordcamp-sf-2011-debugging-in-wordpress
• http://nacin.com/2010/04/23/5-ways-to-debug-wordpress/

Helpful plugins:

• Core Control – http://wordpress.org/extend/plugins/core-control/
• BlackBox Debug Bar – http://wordpress.org/extend/plugins/blackbox-debug-bar/
• P3 (Plugin Performance Profiler)  – http://wordpress.org/extend/plugins/p3-profiler/
• Debug Objects – http://wordpress.org/extend/plugins/debug-objects/
• Depreciated Notices – http://wordpress.org/extend/plugins/log-deprecated-notices/
• Code Localization – http://wordpress.org/extend/plugins/codestyling-localization/
• Hook Sniffer – http://wordpress.org/extend/plugins/wordpress-hook-sniffer/
• Rewrite Analyzer – http://wordpress.org/extend/plugins/monkeyman-rewrite-analyzer  
• XHProf – http://wordpress.org/extend/plugins/wp-xhprof-profiler/
• MySQL Profiler – http://wordpress.org/extend/plugins/mysql-profiler/
• SQL Monitor – http://wordpress.org/extend/plugins/sqlmon/

Extras:

WordPress Hooks database: http://adambrown.info/p/wp_hooks

How to style debug output using Krumo or Kint:
http://wordpress.stackexchange.com/questions/40952/nice-way-to-print-r-arrays

Webgrind: https://github.com/jokkedk/webgrind