atom feed60 messages in net.php.lists.internalsRe: [PHP-DEV] Callable type
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Hannes MagnussonJun 6, 2011 12:41 pm.txt
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Derick RethansJun 6, 2011 4:30 pm 
Martin ScottaJun 6, 2011 7:50 pm 
Jordi BoggianoJun 7, 2011 3:08 am 
Hannes MagnussonJun 7, 2011 6:59 am 
Richard QuadlingJun 7, 2011 7:03 am 
Hannes MagnussonJun 7, 2011 7:21 am 
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Matthew Weier O'PhinneyJun 7, 2011 9:10 am 
Stas MalyshevJun 7, 2011 11:50 am 
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dukeofgamingJun 7, 2011 3:38 pm 
Johannes SchlüterJun 7, 2011 4:39 pm 
David ZülkeJun 7, 2011 5:04 pm 
Alexey SheinJun 7, 2011 10:24 pm 
Hannes MagnussonJun 8, 2011 1:31 am 
Hannes MagnussonJun 8, 2011 1:38 am 
Alexey SheinJun 8, 2011 1:47 am 
Johannes SchlüterJun 8, 2011 3:04 am 
Hannes MagnussonJun 8, 2011 3:17 am 
Richard QuadlingJun 8, 2011 3:27 am 
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Johannes SchlüterJun 8, 2011 3:31 am 
Richard QuadlingJun 8, 2011 3:31 am 
Anthony FerraraJun 8, 2011 6:31 am 
Martin ScottaJun 8, 2011 7:42 am 
Martin ScottaJun 8, 2011 7:48 am 
David ZülkeJun 8, 2011 8:53 am 
Johannes SchlüterJul 10, 2011 12:02 pm 
Stas MalyshevJul 10, 2011 12:57 pm 
Hannes MagnussonJul 11, 2011 1:21 am 
Stas MalyshevJul 11, 2011 1:27 am 
Peter CowburnJul 11, 2011 1:37 am 
Hannes MagnussonJul 11, 2011 1:38 am 
Stas MalyshevJul 11, 2011 1:43 am 
Subject:Re: [PHP-DEV] Callable type
From:Richard Quadling (rqua@gmail.com)
Date:Jun 8, 2011 3:27:31 am
List:net.php.lists.internals

On 8 June 2011 09:47, Alexey Shein <con@gmail.com> wrote:

2011/6/8 Hannes Magnusson <hann@gmail.com>:

We have the situation in the docs that parameters declared as arrays do not follow the typehinting rules, but parameters as class names do. Re-using the callback from the docs could get confusing when extensions start to typehint on it, but not the core..

I think there is a subtle difference between a callback, and a callable. In javascript for example, callback is something that is executed on certain events "onsuccess" is the typical example. There is nothing that says the callable parameter gets executed as a part of an event, and I think the default usecase would be to execute it right away (f.e. filtering data).

I think I would prefer callable, but I could live with either.

Wikipedia defines callback as "a reference to executable code, or a piece of executable code, that is passed as an argument to other code". So there's no "event" meaning put by default, it's just very often seen callback's usage in javascript. I just like "callback" term more :)

An interesting issue here.

Closures, classes with an __invoke method and strings containing existing function names all pass is_callable() and can be called using ().

But, array('class', 'method') also passes is_callable, but isn't a callback.

http://pastebin.com/Yb5nJ8DB

outputs ...

object is callable Invoked : Wed, 08 Jun 2011 11:24:09 +0100 object is callable Closure : Wed, 08 Jun 2011 11:24:09 +0100 string is callable Wed, 08 Jun 2011 11:24:09 +0100 array is callable Handling Array via call_user_func Func array : Wed, 08 Jun 2011 11:24:09 +0100

So, callable and callbacks are 2 different things.

Callable 1 - closures. 2 - classes with an __invoke method. 3 - strings to an existing function. 4 - array('class', 'method')

Callbacks Only 1, 2 and 3 from the above list.

If you try to use $funcarray(), you get the following fatal error ...

Fatal error: Function name must be a string

-- Richard Quadling Twitter : EE : Zend : PHPDoc @RQuadling : e-e.com/M_248814.html : bit.ly/9O8vFY : bit.ly/lFnVea

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