Get the value(s) of require property as an array. Require property
contains the usernames or groups users who are allowed to access
protected resources. Value valid-user means all users listed in
password file are allowed to access.
Parameter
string $type - if 'string' return value
will be a string with usernames separated by a space character.
Otherwise return value will be an array(). Defaults to an array.
Return value
mixed string or array depending on $type parameter.