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Date: Wed, 16 Jun 2004 21:17:16 +0200
Reply-To: Marcus Boerger <helly@php.net>
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To: Ray Hilton <ray.hilton@memefeeder.com>
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	internals@lists.php.net
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Subject: Re: [PHP-DEV] Re: ClassHints and NULL
From: helly@php.net (Marcus Boerger)

Hello Ray,

Wednesday, June 16, 2004, 4:26:26 PM, you wrote:

> Hi all,

[....]

 - NOTHING stops you from passing NULL to functions.
 - Typhints are a shortcut for an 'instanceof'`test

 - now try NULL instanceof stdclass:

php-cvs $ php -r 'var_dump(NULL instanceof stdclass);'
bool(false)

- what you probablywant is
function bla($x) {
  if (is_null($x)) {
    // handle null
  } else if ($x instanceof whatever) {
    // handle instance
  } else {
    // handle error
  }
}

- if you look again you'll see that you are doing *three different*
  things in your code. Typehints have a different usage!
  
best regards
marcus