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:

1.  it has not yet been initialized.

2.  it points to a destructed object.

3.  it  is  a function (formal) parameter that corresponds to a missing
    actual argument.

SEE ALSO

mapp(3),  stringp(3),  pointerp(3),  objectp(3),  intp(3),  bufferp(3),
floatp(3), functionp(3), undefinedp(3), errorp(3)
Improve this page

Every page on this site is maintained by user like you!

Edit On Github