- fixed default value of error_reporting.
 - http://ml.php.gr.jp/pipermail/php-doc/2013-September/001107.html
 - PHP 5.3.0 or later
   - https://github.com/php/php-src/blob/master/Zend/zend.c#L72
 - Prior to PHP 5.3.0
   - https://github.com/php/php-src/blob/PHP-5.0/Zend/zend.c#L68


git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@331284 c90b9560-bf6c-de11-be94-00142212c4b1