Fix various PHP code bugs found using static analysis (#1489086)

Aleksander Machniak

2013-05-06 187cf5e1cdee87fb1d26599f93202222bb7b8a4b

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<?php
require_once 'Net/IDNA2/Exception.php';
 
class Net_IDNA2_Exception_Nameprep extends Net_IDNA2_Exception
{
}