[ci skip] 3.1.9 release

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diff --git a/user_guide_src/source/general/environments.rst b/user_guide_src/source/general/environments.rst
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-##############################
-Handling Multiple Environments
-##############################
-
-Developers often desire different system behavior depending on whether
-an application is running in a development or production environment.
-For example, verbose error output is something that would be useful
-while developing an application, but it may also pose a security issue
-when "live".
-
-The ENVIRONMENT Constant
-========================
-
-By default, CodeIgniter comes with the environment constant set to use
-the value provided in ``$_SERVER['CI_ENV']``, otherwise defaults to
-'development'. At the top of index.php, you will see::
-
-	define('ENVIRONMENT', isset($_SERVER['CI_ENV']) ? $_SERVER['CI_ENV'] : 'development');
-
-This server variable can be set in your .htaccess file, or Apache 
-config using `SetEnv <https://httpd.apache.org/docs/2.2/mod/mod_env.html#setenv>`_. 
-Alternative methods are available for nginx and other servers, or you can 
-remove this logic entirely and set the constant based on the server's IP address.
-
-In addition to affecting some basic framework behavior (see the next
-section), you may use this constant in your own development to
-differentiate between which environment you are running in.
-
-Effects On Default Framework Behavior
-=====================================
-
-There are some places in the CodeIgniter system where the ENVIRONMENT
-constant is used. This section describes how default framework behavior
-is affected.
-
-Error Reporting
----------------
-
-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. Disabling error reporting in production is a :doc:`good security
-practice <security>`.
-
-Configuration Files
--------------------
-
-Optionally, you can have CodeIgniter load environment-specific
-configuration files. This may be useful for managing things like
-differing API keys across multiple environments. This is described in
-more detail in the environment section of the :doc:`Config Class
-<../libraries/config>` documentation.
\ No newline at end of file