Web Reference: Setting the ENVIRONMENT constant to a value of development will cause all PHP errors to be rendered to the browser when they occur. Conversely, setting the constant to production will disable all error output. Feb 25, 2026 · We will know how to enable developer mode to be able to view errors and warnings from the browser in CodeIgniter 4 Dec 16, 2022 · Thank you for the answer! The problem turned to be the CI4 toolbar. Switched it off and now its working normally in both developer and production mode. Not sure why, but I never really used that anyway, so I won't miss it.
YouTube Excerpt: Rename the env file as .env, then removed # from CI_ENVIRONMENT and modified CI_ENVIRONMENT =
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