Developers write configuration scripts using different structural patterns depending on the application’s design patterns. 1. The Global Constants Approach
Double-check your DB_HOST (some hosts require an IP address or a specific URL instead of "localhost"), and re-verify your database user password. White Screen of Death (WSoD)
Ensure the file permissions are set so that only the owner can read/write the file (e.g., 600 or 640 on Linux servers). Conclusion
: You can change a site-wide constant (like SITE_NAME ) once instead of searching through dozens of files. config.php
: An introductory overview explaining what the file does and why it is the most important file in your installation. WordPress Developer Resources Specialized and Alternative Uses
Remove any spaces, blank lines, or closing ?> tags at the absolute end of the file. 6. Checklist for Production Deployment
A robust config.php system adapts to where it runs. The simplest method is to check a server variable like APP_ENV . White Screen of Death (WSoD) Ensure the file
// Define database connection settings $db_connection = array( 'host' => DB_HOST, 'username' => DB_USERNAME, 'password' => DB_PASSWORD, 'database' => DB_NAME );
Order Allow,Deny Deny from all Use code with caution. location ~* config\.php$ deny all; return 404; Use code with caution. Modern Development: Transitioning to .env Files
Some developers prefer an object-oriented configuration: include it using a relative path:
Create config.dev.php , config.prod.php , and then include the appropriate one based on a server environment variable. This works but is less secure than env vars because the production file might accidentally be exposed if your web server misconfiguration serves .php files as plain text.
Then in index.php , include it using a relative path:
