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To: Lukas Kahwe Smith <mls@pooteeweet.org>
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Date: Tue, 22 Jul 2008 13:07:07 +0200
References: <8A5D4032-1FC4-44BB-90F3-61B802F10159@pooteeweet.org>
Subject: Re: [PHP-DEV] closures questions
From: mls@pooteeweet.org (Lukas Kahwe Smith)


On 22.07.2008, at 13:04, Lukas Kahwe Smith wrote:

> 1) Closures on class properties just don't work, the only way to do  
> it is
> to do something like:
>
> $c = $a->b;
> $c();
>
> Calling: $a->b(); will result in method A::B() does not exists.

would be nice to get this fixed, but at worst it should be documented.

> 2) Closures can be defined as constants values because of its  
> toString method:
>
> define('Closure', function(){ echo 'Test'; });
>
> echo constant('Closure'); /* (string) Closure object */
>
> 3) Since Closures have this toString method, but its not showing up  
> in Reflection:
>
> Reflection::export(new ReflectionClass('Closure'));

so do we even want the toString() method?

> 4) var_export() and Closures is useless, any call to var_export()  
> like the example
> below will all be the same:
>
> $lambda = function()
> {
>    echo '&#923; Lambda';
> };
>
> var_export($lambda);
>
> /*
> Closure::__set_state(array(
> ))
> */
>
> Maybe it could return some relevant information for exporting the  
> closure across
> data

not a huge biggy to me.

> 5) Its impossible to clone a closure using the cloning keyword:
>
> $a = function(){};
> $b = clone $a;
>
> This makes it hard to make a copy of the closure because of objects  
> always are
> passed by reference.


I guess this is a draw back from the OO approach (rather than the  
original resource approach), but solvable?

regards,
Lukas Kahwe Smith
mls@pooteeweet.org