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Cc: Andi Gutmans <andi@zend.com>,
 internals@lists.php.net,
 Sean Coates <sean@caedmon.net>
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Date: Tue, 20 Mar 2007 14:40:46 -0400
To: Stanislav Malyshev <stas@zend.com>
Subject: Re: [PHP-DEV] PATCH: anonymous functions in PHP
From: wez@omniti.com (Wez Furlong)

You need the callable type to store the closure information.
Either that, or you need to store it in the op_array, which is "bad"  
because you don't know when you can free that closure state, so you  
have to carry it around for the rest of the request.

I agree about $_SCOPES['foo'].  I'm actually starting to lean towards  
just copying the entire local scope hash table and storing it in the  
callable/closure, and using that to initialize the symtable when you  
call into the function.

--Wez.



On Mar 20, 2007, at 2:20 PM, Stanislav Malyshev wrote:

>>> of the function.  Again, this would be created based on the  
>>> $_SCOPES fixup information, and again, $_SCOPES['i'] would be  
>>> rewritten as simply $i in the op_array.
>>>
>>> So the funcs array might look like this is var_dump()'d:
>>>
>>> 0 => callable('__anon_0', array('i' => 0)),
>>> 1 => callable('__anon_0', array('i' => 1)),
>>> 2 => callable('__anon_0', array('i' => 2))
>
> How do you know it's 'i'? Does it mean compiler should record any  
> reference to _SCOPES? What if I do $_SCOPES[$foo] - is it that  
> unthinkable? What if I doo $a = "_SCOPES", $$a[$foo]?
>
> Only way I see you can really do it is to explicitly declare the  
> imported variables, otherwise you'll lose them - PHP is too dynamic  
> for compiler to be able to statically resolve it.
>
> On a side note: why one needs callable type? What can be done with  
> it which can't be done with string and $string()?
> -- 
> Stanislav Malyshev, Zend Products Engineer
> stas@zend.com  http://www.zend.com/
>