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:
- it has not yet been initialized.
- it points to a destructed object.
- it is a function (formal) parameter that corresponds to a missing actual
argument.
SEE ALSO
undefinedp(3)
, mapp(3)
, stringp(3)
, pointerp(3)
, objectp(3)
, intp(3)
.