.\"determine whether or not a given variable is null. .DT nullp Discworld driver help nullp Name .SI 5 nullp() - determine whether or not a given variable is null. .EI Synopsis .SI 5 int nullp(mixed arg); .EI Description .SP 5 5 Return 1 if `arg' is null. 'arg' will be null in the following cases: 1) it has not yet been initialized. 2) it points to a destructed object. .EP See also .SI 5 undefinedp(3), mapp(3), stringp(3), pointerp(3), objectp(3), intp(3). .EI