WordPress Debugging: Transitioning from WP_DEBUG_DISPLAY to WP_DEBUG_LOG for Production

When managing WordPress deployments, the transition from a development environment to a production server requires a change in how PHP errors are handled. While WP_DEBUG is essential for identifying fatal errors or the "White Screen of Death," displaying these errors directly in the browser via WP_DEBUG_DISPLAY creates a security risk by exposing absolute file paths and server configurations.

The goal is to maintain full diagnostic visibility without compromising the front-end user experience or security. This involves shifting the error output mechanism to a server-side file using WP_DEBUG_LOG, which captures errors in /wp-content/debug.log.

There is uncertainty regarding how server-level php.ini settings or hosting provider overrides may conflict with these wp-config.php constants, potentially preventing the log file from being created even when the constants are set to true.

• Does a server-level display_errors = Off setting in php.ini override the WP_DEBUG_DISPLAY constant?
• In what specific scenarios would WP_DEBUG_LOG fail to write to the filesystem despite being enabled in the configuration?