NAME

nullp() - determine whether or not a given variable is null.

SYNOPSIS

int nullp(mixed arg);

DESCRIPTION

Return 1 if `arg' is null. 'arg' will be null in the following cases:

SEE ALSO

undefinedp(3) , mapp(3) , stringp(3) , pointerp(3) , objectp(3) , intp(3) .