# Modifying configure.php

The file /includes/configure.php contains critical setup information necessary to run PhreeBooks. It is created during the setup process and generally shouldn't be touched (except to make it read-only).

the following constant variables are set in configure.php during the setup script:

- HTTP_SERVER - Main webserver: eg, http://localhost - should not be empty for production servers
- HTTPS_SERVER - Secure webserver: eg, https://localhost - should not be empty for production servers
- ENABLE_SSL_ADMIN - secure webserver
- DIR_WS_ADMIN - url path (these paths are relative to top of your webspace)
- DIR_FS_ADMIN - The physical path is a COMPLETE path to your PhreeBooks files.
- DEFAULT_LANGUAGE - define the default language (can also be changed at login)
- DB_TYPE - databse type (currently only mysql is supported)
- DB_PREFIX - If phreebooks shares the database with other applications, a table prefix may be used.