NYCPHP Meetup

[Jeremy Mikola]

The concept of "regional" variables you're describing already exists via
use statements for anonymous functions. The following should be possible:

function array_sanitize($array, $filter) {
   $negFilter = function($arg) use ($filter) {
       return !$filter($arg);
   };
   return array_filter($array, $negFilter)
}

See example #3 here: http://php.net/manual/en/functions.anonymous.php

On Wednesday, November 16, 2011, Jim Williams <jim at pagenotes.com> wrote:
> I just ran across a simple problem I couldn't solve, namely to create a
function that does the opposite of array_filter, call it array_sanitize.
 The closest I could come doesn't work for anonymous functions:
>
> <?php
>  function array_sanitize($array, $filterName) {
>    $negFilter = create_function('$arg', 'return !'.$filterName.'($arg);');
>    return array_filter($array, $negFilter);
>  }
>  //Example:
>  $a = array('a'=>6,'b'=>1,'c'=>4,'d'=>9);
>  function isOdd($arg) { return $arg % 2 == 1; }
>  print_r (array_sanitize($a, 'isOdd')); // outputs 'Array ( [a] => 6 [c]
=> 4 )'
> ?>
>
> If we had variables of intermediate scope, call them "regional"
variables, we could do this:
> /*
>  function array_sanitize($array, $filter) {
>    $negFilter = function($arg) {
>      regional $filter;
>      return !$filter($arg)
>    };
>  return array_filter($array, $negFilter)
>  }
> */
>
> So, my question is how and whether to advocate the need for variables of
intermediate scope.
> Specifically, is there a public forum for suggesting improvements to PHP?
>
> Jim Williams
> J. G. Williams Design
>
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-- 
jeremy mikola
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