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Date: Wed, 20 Mar 2013 20:05:58 +0100
To: Carlos Rodrigues <carlos.vini@gmail.com>,internals@lists.php.net
Message-ID: <42394b81-ce69-45ea-b383-74dcd365b2d4@email.android.com>
Subject: Re: [PHP-DEV] Method check - Can someone create a RFC for it?
From: johannes@schlueters.de (=?ISO-8859-1?Q?Johannes_Schl=FCter?=)



Carlos Rodrigues <carlos.vini@gmail.com> wrote:
>So instead of writing
>if ($obj->image) {
>echo $obj->image->getUrl();
>}
>
>He wrote:
>echo $obj->image->getUrl();

Make the property private and add a getter which can throw an exception if no image is available ...

class C {
    private $image;
    public function hasImage() { return (bool)$this->image; }
    public function getImage() { if (!$this->image) { throw new NoImageException(); } return $this->image; }
}
echo $obj->geImage()->getUrl(); // Exception which can be caught.

No nee dto change the language and add a new cosntruct (which your developer will forget, if he forgets the if already ....)

johannes