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Cc: "internals@lists.php.net" <internals@lists.php.net>
Date: Fri, 22 Mar 2013 07:41:22 +0800
To: Carlos Rodrigues <carlos.vini@gmail.com>
Subject: Re: [PHP-DEV] Method check - Can someone create a RFC for it?
From: tjerk.meesters@gmail.com (Tjerk Meesters)

On 21 Mar, 2013, at 2:08 AM, Carlos Rodrigues <carlos.vini@gmail.com> wrote:=


> Hi,
>=20
> I'd like to suggest a new functionality for PHP. I don't know the
> internals, and i can't create a patch implementing this. I'm writing
> here in case someone likes this idea and write a RFC.
>=20
> We've had a problem recently where one of our developers forgot an "if".
>=20
> So instead of writing
> if ($obj->image) {
> echo $obj->image->getUrl();
> }
>=20
> He wrote:
> echo $obj->image->getUrl();
>=20
> Here, locally, it was working cause we had the image. But when we
> updated the online version we got a "Fatal error: Call to a member
> function getUrl() on a non-object" cause someone didn't upload the
> image in one of the records that we're on the home page.
>=20
> Fatal errors like this can't be catched by a try/catch. And since this
> getUrl() was not essential for the page, we'd better output an empty
> string then having the site offline.

You can register a shutdown function with register_shutdown_function() and c=
heck for error_get_last() inside.=20

In most cases you can't really handle this particular error very well anyway=
. At least with this you can have the full error emailed to you if you wish a=
nd print some kind of error message on the page.=20

>=20
> One might say: "you guys should have tested it better", or "The image
> field should be mandatory in the back end."
> And it's true, he should have written that extra "if {}".
>=20
> Examining this problem we happened to stumble open Ruby's and
> Coffescript's method check.
> Something like this:
>=20
> $obj->image?->getUrl()?;
>=20
> So my suggestion is:
>=20
> Create something like $foo->bar?() or $foo->bar()?, where you don't
> care whether the function exists, or if $foo is an object. If it
> doesn't exist you just return null.
> I guess there are plenty of systems out there where it's better to
> output an empty string than having your site offline, just cause the
> programmer couldn't test it completely.
>=20
> Thanks for reading it.
>=20
> Carlos Rodrigues
>=20
> --=20
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>=20