PHP: rfc:true-nested-function-support

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====== Request for Comments: True nested function support ======
  * Version: 1.0
  * Date: 2011-06-18
  * Author: Rune Kaagaard <rumi.kg@gmail.com>
  * Status: Draft
  * First Published at: https://wiki.php.net/rfc/true-nested-function-support

===== Introduction =====
Stub

===== Why nested functions are useless at the moment =====
  * They exist in the global namespace.
  * If the parent function is called twice they will be defined twice and thus give a fatal error.

===== Code examples =====

====== 1) Current idiomatic usage of helper functions ======
<code php>
    function _prefix_functionname_helperfunctionname($arg1, $arg2) {
        ;
    }
           
    function prefix_functionname() {
       // Code here...
       somefunc(prefix_functionname_helperfunctionname($arg1, $arg2));
    }
</code>

====== 2) Appending the function name and wrapping in function_exists() ======
<code php>
    function prefix_functionname() {
       if (!function_exists('prefix_functionname_innerfunctionname')) {
           function prefix_functionname_innerfunctionname($arg1, $arg2) {
               ;
           }
       }
       // Code here...
       somefunc(prefix_functionname_innerfunctionname($arg1, $arg2));
    }
</code>

====== 3) Using closures ======
<code php>
    function prefix_functionname() {
       $innerfunctionname = function ($arg1, $arg2) {
           ;
       }
       // Code here...
       somefunc($innerfunctionname($arg1, $arg2));
    }
</code>

====== 4) Using new syntax ======
<code php>
    function prefix_functionname() {
       function innerfunctionname($arg1, $arg2) {
           ;
       }
       // Code here...
       somefunc(innerfunctionname($arg1, $arg2));
    }
</code>

===== Todo for this RFC =====
  * Write little script that checks for the current use of nested functions in common frameworks like Symphony and Zend. I am assuming this is zero.
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