WordPress error logs stop being intimidating once you understand their structure. This guide decodes every PHP error severity level (Fatal, Warning, Notice, Deprecated, Parse), shows how to read stack traces, documents the most common WordPress-specific errors with root causes and fixes, explains error_reporting levels, and covers log security and rotation.
Most developers set WP_DEBUG and stop there. This guide documents every WordPress debug constant in wp-config.php: WP_DEBUG, WP_DEBUG_LOG, WP_DEBUG_DISPLAY, SCRIPT_DEBUG, SAVEQUERIES, WP_CACHE, CONCATENATE_SCRIPTS, and more. Includes correct configurations for local development, staging, and production, plus how to use ini_set for custom error log paths.
