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Date: Thu, 10 Jan 2008 11:20:53 +0100
Reply-To: Marcus Boerger <helly@php.net>
Message-ID: <895124747.20080110112053@marcus-boerger.de>
To: "Ryusuke SEKIYAMA" <rsky0711@gmail.com>
CC: internals@lists.php.net, "Marcus Boerger" <helly@php.net>
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Subject: Re: [PHP-DEV] [RFC] Anonymous functions
From: helly@php.net (Marcus Boerger)

Hello Ryusuke,

  +1, looks pretty nice, makes my life easier in some cases and is closer to
  other languages like pythin so i can transfer concepts easily which is a
  big plus for me.

marcus

Thursday, January 10, 2008, 11:09:26 AM, you wrote:

> Hello, lists,

> We have discussed about implementing anonymous functions and
> closures in PHP.
> However, I consider that implementing anonymous functions and
> implementing lexical scopes should be discussed separately.
> # Even though I like closure.  
> So I wrote anonymous function patch for PHP 5.3 and 6.0.


> Patches (inlcude tests):
> for PHP 5.3: http://www.opendogs.org/pub/php-5.3dev-080109-anon.patch
> for PHP 6.0: http://www.opendogs.org/pub/php-6.0dev-080109-anon.patch


> Featues:
> - Unlike create_function(), there is no need to take care of
>   quotes, backslashes and dollars .
> - Can be used in loop, but be compiled only once.
> - Supports recursive call using __FUNCTION__.
> - Supports inline execution. It works like a block scope.
> - Works with opcode caches.
>   Since I couldn't build APC against PHP 5.3, I have tested
>   PHP 5.2.5 + anonymous function patch and APC 3.0.16.


> Example:
> <?php
> // callback
> $arr = array(5, 3, 6, 0);
> usort($arr, function($a, $b){ return $a - $b; });
> print_r($arr); // 0, 3, 5, 6

> // assign to a variable
> $lambda = function(){
>   echo "Hello, World!\n";
> };
> $lambda(); // "Hello, World!"

> // inline execution
> $result = function($a, $b){
>   return $a + $b;
> }(1, 2);
> var_dump($result); // "int(3)"
?>>


> The anonymous function name is composed of '\0', "ZEND_ANON<#serial>",
> filename and character position.
> - Leading '\0' blocks to be displayed by get_defined_functions().
> - "ZEND_ANON<" helps determine wheter the function is anonymous or not
>   because '<' cannot be used for user-defined function name.
> - Serial number and file informations make the name unique.
> - char anon_key_buf[32] is long enough because
>   `snprintf(anon_key_buf, 32, "ZEND_ANON<%llu>", (unsigned long
> long)UINT64_MAX)'
>   returns 31.


> Regards,


> 2008/1/6, Marcus Boerger <helly@php.net>:
>> Hello Stanislav,
>>
>>   tha makesw three then already, how about we ask around again?
>> Ryusuke, can you please start a new '[RFC] Square brackets shortcut' thread
>> to collect opinions and pass along the patch for that?
>>
>> I like the anonymous function patch too. It is clean and simple. Maybe you
>> want to start a second '[RFC] Anonymous functions' thread with that patch.
>>
>> Can you also please add tests for both?
>>
>> marcus
>>
>> Wednesday, January 2, 2008, 7:51:06 PM, you wrote:
>>
>> >> the square bracket array syntax patch for PHP 5.3,
>> >>   http://www.opendogs.org/pub/php-5.3dev-080101-sbar.patch
>>
>> > I remember we discussed that already and it was rejected then (even
>> > though myself and Andi liked it) - did the people that objected then
>> > change their minds?
>>
>>
>>
>> Best regards,
>>  Marcus
>>
>>


> -- 
> /**
>  * Ryusuke SEKIYAMA
>  * rsky0711@gmail.com
>  */




Best regards,
 Marcus