Use `defined()` first, `constant()` only when you need a dynamic lookup, and `get_defined_constants(true)` for audits. This updated PHP and WordPress guide explains the safe pattern for `DISALLOW_FILE_EDIT` and environment troubleshooting.
A practical guide to debugging PHP with current error reporting, logging, variable inspection, and Xdebug recommendations for development, staging, and production environments.
A safer, current guide to debugging WordPress on a live site: log errors without exposing them to visitors, use WP-CLI for isolation, and avoid outdated cache assumptions.