How can PHP developers securely store database connection information in external configuration files?

To securely store database connection information in external configuration files, developers can utilize environment variables or encryption techniques. By using environment variables, sensitive data such as database credentials are kept outside of the codebase, reducing the risk of exposure. Encryption techniques can also be employed to secure the data within the configuration file itself, ensuring that even if the file is compromised, the information remains protected. 

```php
// config.php

define('DB_HOST', getenv('DB_HOST'));
define('DB_USER', getenv('DB_USER'));
define('DB_PASS', getenv('DB_PASS'));
define('DB_NAME', getenv('DB_NAME'));
```

In this example, the database connection information is stored in environment variables and accessed in the PHP code through the `getenv()` function. This way, the actual credentials are not hardcoded in the configuration file, enhancing security.

Keywords

PHP database connection external configuration files security encryption

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