Add variables for default configuration

[guilhem]

Adding ability to set default configuration in wp-config.php.

[vishalkakadiya]

Hi @guilhem 👋

Thank you for taking the time to open this PR. 🙇

Could you share more details about the use case behind defining all the options as constants?

[yashhhYB]

Hello @guilhem,

Thank you for your contribution to enhancing the configuration flexibility in wp-config.php. I’ve reviewed the proposed changes, and they look like a great addition for customizing default configurations. Here are some suggestions and feedback to refine this further:

Key Suggestions:
Validation for Default Configuration Variables:

To prevent issues with missing or incorrect configurations, you could add validation logic to ensure that only valid values are assigned to these new default configuration variables.
Example:
php
Copy
Edit
if ( ! defined( 'DEFAULT_CONFIG_VAR' ) || empty( DEFAULT_CONFIG_VAR ) ) {
define( 'DEFAULT_CONFIG_VAR', 'default_value' );
}
Backward Compatibility:

Ensure the newly added variables do not override existing settings in wp-config.php. If a variable is already defined, skip redefining it to avoid unexpected behavior.
Documentation for Developers:

Including comments or documentation in the code to explain how these default configurations can be set and overridden by developers would be highly beneficial.
Testing:

Have you tested this change across various environments to ensure compatibility and seamless operation? If not, I can assist with writing test cases to cover edge cases for these default configurations.
Suggested Implementation of Default Configuration Variables:
Here’s an example of how default variables can be conditionally set:

phpCode

// Define default database table prefix if not already set.
if ( ! defined( 'DB_PREFIX' ) ) {
define( 'DB_PREFIX', 'wp_' );
}

// Define default memory limit.
if ( ! defined( 'WP_MEMORY_LIMIT' ) ) {
define( 'WP_MEMORY_LIMIT', '128M' );
}
Follow-Up:
Let me know if you’d like assistance with writing additional tests, improving documentation, or handling edge cases. I’m happy to collaborate on refining this feature further.

Looking forward to your feedback!