php-the-right-way/_posts/10-05-01-Configuration-Files.md

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Configuration Files

When creating configuration files for your applications, best practices recommend that one of the following methods be followed:

• It is recommended that you store your configuration information where it cannot be accessed directly and pulled in via the file system.
• If you must store your configuration files in the document root, name the files with a .php extension. This ensures that, even if the script is accessed directly, it will not be output as plain text.
• Information in configuration files should be protected accordingly, either through encryption or group/user file system permissions.
• It is a good idea to ensure that you do not commit configuration files containing sensitive information e.g. passwords or API tokens to source control.