It's actually mentioned in a comment of the manual online version at http://www.php.net/manual/en/function.is-array.php
Kaplan On Mon, Dec 6, 2010 at 9:07 AM, <[email protected]> wrote: > Package: php-doc > Version: 20100521-2 > Severity: wishlist > File: /usr/share/doc/php-doc/html/function.is-array.html > > /usr/share/doc/php-doc/html/function.isset.html > won't print an error on an undefined variable, but > /usr/share/doc/php-doc/html/function.is-array.html > will, but this is not mentioned. > > >

