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| <h1>Handling Multiple Environments</h1> |
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| <p> |
| 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". |
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| <h2>The ENVIRONMENT Constant</h2> |
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| <p> |
| By default, CodeIgniter comes with the environment constant set to |
| '<kbd>development</kbd>'. At the top of index.php, you will see: |
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| <code> |
| define('<var>ENVIRONMENT</var>', '<var>development</var>'); |
| </code> |
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| <p> |
| 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. |
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| <h2>Effects On Default Framework Behavior</h2> |
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| <p> |
| There are some places in the CodeIgniter system where the <kbd>ENVIRONMENT</kbd> |
| constant is used. This section describes how default framework behavior is |
| affected. |
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| <h3>Error Reporting</h3> |
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| <p> |
| Setting the <kbd>ENVIRONMENT</kbd> constant to a value of '<kbd>development</kbd>' will |
| cause all PHP errors to be rendered to the browser when they occur. Conversely, |
| setting the constant to '<kbd>production</kbd>' will disable all error output. Disabling |
| error reporting in production is a <a href="security.html">good security practice</a>. |
| </p> |
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| <h3>Configuration Files</h3> |
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| <p> |
| 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 <a href="../libraries/config.html#environments">Config Class</a> documentation. |
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