Method: Checks if a “constant” has been set in constants Manager and has the value of true

Method: Checks if a “constant” has been set in constants Manager, and if not, checks if the constant was defined with define( ‘name’, ‘value ).

Method: Attempts to retrieve the “constant” from constants Manager, and if it hasn’t been set, then attempts to get the constant with the constant() function. If that also hasn’t been set, attempts to get a value from filters.

Method: Sets the value of the “constant” within constants Manager.

Method: Will unset a “constant” from constants Manager if the constant exists.

Method: Resets all of the constants within constants Manager.