ReflectionParameter::allowsNull Checks if null is allowed &reftitle.description; public boolReflectionParameter::allowsNull Checks whether the parameter allows &null;. &warn.undocumented.func; &reftitle.parameters; &no.function.parameters; &reftitle.returnvalues; &true; if &null; is allowed, otherwise &false; &reftitle.seealso; ReflectionParameter::isOptional