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Reply-To: RQuadling@googlemail.com
Date: Wed, 4 Mar 2009 11:33:32 +0000
Message-ID: <10845a340903040333g5fd001fdw73fc17eacbd968c9@mail.gmail.com>
To: PHP Internals List <internals@lists.php.net>
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Subject: Are there plans to allow anonymous functions as callbacks?
From: rquadling@googlemail.com (Richard Quadling)

Hi.

Quite a simple question (assuming I've got the terminology correct).

Are there any plans to allow code like this (amended example taken
from the array_map() documentation) ...

<?php
$a = array(1, 2, 3, 4, 5);
$b = array_map(function($n){return($n * $n * $n)}, $a);
print_r($b);

For me, this is cleaner than having a use-once, namespace-polluting function.

Currently, this is producing a parse error.


A real alternative though would be to allow nested functions...

<?php
function cube_array($a) {
  function cube($n) {
    return($n * $n * $n);
  }
  return array_map("cube", $a);
}
$a = array(1, 2, 3, 4, 5);
$b = cube_array($a);
print_r($b);

Ideally, cube() would not be visible outside of cube_array(). Scoped functions.

Regards,

Richard Quadling.
-- 
-----
Richard Quadling
Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731
"Standing on the shoulders of some very clever giants!"