Determines whether the current request is a WordPress Ajax request.

Determines whether the current request is a WordPress cron request.

Don’t load all of WordPress when handling a favicon.ico request.

Finalize scraping for edited file errors.

Fix $_SERVER variables for various setups.

Retrieve an array of active and valid plugin files.

Retrieves an array of active and valid themes.

Retrieves the current environment type.

Retrieve an array of must-use plugin files.

Return the HTTP protocol sent by the server.