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Date: Wed, 19 Sep 2012 19:01:02 +0100
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To: Steve Clay <steve@mrclay.org>
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Subject: Re: [PHP-DEV] RFC: alternative callback syntax
From: ajf@ajf.me (Andrew Faulds)

On 19/09/12 18:56, Steve Clay wrote:
> On 9/19/12 1:19 PM, Andrew Faulds wrote:
>> I completely agree. How about &function_name? Resembles C (function 
>> pointers!), and unless
>> I'm getting confused, it isn't currently legal syntax for something 
>> else.
>
> $cb = & Foo::doSomething;
> $cb = & foo_doSomething;
> $cb = & $obj->doSomething;
>
> The last looks like a reference to a property, though having verb 
> method names would help distinguish. Not sure if the ambiguity would 
> make this difficult to implement.
Oops, good point!
>
> Some other ideas:
>
> $cb = (callable) $obj->bar;
Ah, but (callable) that won't work for global functions, since 
(callable) is a cast, and if I try to do:

     $cb= (callable) mysql_real_escape_string;

I'd actually try to access a constant named 'mysql_real_escape_string' 
(bad!!)
> $cb = callable $obj->bar;
> $cb = callable::$obj->bar;
> $cb = $obj->bar::callable;
Here's two other possibilities from me:

     $cb = {mysql_real_escape_string};
     $cb = &{mysql_real_escape_string};

Both are completely illegal just now, I think.
>
> Steve


-- 
Andrew Faulds
http://ajf.me/