Diff of PHP7/ext

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- Upgrading PHP extensions from PHP5 to NG
--  https://wiki.php.net/phpng-upgrading
---  http://d.hatena.ne.jp/yoya/20141011/phpng (和訳の途中)

- Converting a PHP Extension to PHP 7
--   http://www.sklar.com/software/php/2015/03/23/converting-a-php-extension-to-php-7/
- PHP5とPHP7の違い（extension編）
--  http://qiita.com/hnw/items/d615e0d4122f247d4c75