Check or set whether WordPress is in “installation” mode.

Determines whether file modifications are allowed.

Determines whether a PHP ini value is changeable at runtime.

Checks whether a string is a valid JSON Media Type.

Checks whether current request is a JSON request, or is expecting a JSON response.

Checks whether current request is a JSONP request, or is expecting a JSONP response.

Check if maintenance mode is enabled.

Is WordPress in Recovery Mode.

Checks if this site is protected by HTTP Basic Auth.

Checks whether current request is an XML request, or is expecting an XML response.