PHP無名関数のuseに渡された変数をクロージャの外から取得する

ReflectionFunction getStaticVariablesで取得できます.
http://php.net/manual/en/class.reflectionfunction.php

<?php
$profile = [
  'name' => 'Isaac Newton',
  'birthday' => '1646-01-04',
];
$closure = function($params) use ($profile) {
  echo "My name is ${$profile['name']}.";
};

$reflection = new ReflectionFunction($closure);
var_dump( $reflection->getStaticVariables() );
  # array(1) {
  #   ["profile"]=>
  #   array(2) {
  #     ["name"]=>
  #     string(12) "Isaac Newton"
  #     ["birthday"]=>
  #     string(10) "1646-01-04"
  #   }
  # }

Environment

$ uname -a
Linux *** 2.6.32-431.el6.x86_64 #1 SMP Fri Nov 22 03:15:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

$ cat /etc/issue
CentOS release 6.5 (Final)
Kernel \r on an \m

$ /usr/local/php-5.5.4/bin/php -v
PHP 5.5.4 (cli) (built: Mar 11 2014 11:06:57)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2013 Zend Technologies

$ /usr/local/php-5.6.0/bin/php -v
PHP 5.6.0 (cli) (built: Aug 29 2014 06:35:44)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2014 Zend Technologies