Fatal error: Uncaught Error: Call to undefined function session_unregister() in /home/opencork/octest.jp/system2/lib/use_session.php:85
Stack trace:
#0 /home/opencork/octest.jp/public_html/contact.php(15): UseSession->Clear('control')
#1 {main}
thrown in /home/opencork/octest.jp/system2/lib/use_session.php on line 85