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<b>Warning</b>:  Undefined variable $conn_id in <b>/www/www-wjp/lehre/vorlesung/info2/ss15/common_code.php</b> on line <b>4</b><br />
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<b>Fatal error</b>:  Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /www/www-wjp/lehre/vorlesung/info2/ss15/common_code.php:4
Stack trace:
#0 /www/www-wjp/lehre/vorlesung/info2/ss15/common_code.php(4): mysqli_query()
#1 /www/www-wjp/lehre/vorlesung/info2/ss15/config.php(27): mysqli_query_first()
#2 /www/www-wjp/lehre/vorlesung/info2/ss15/index.php(6): require_once('...')
#3 {main}
  thrown in <b>/www/www-wjp/lehre/vorlesung/info2/ss15/common_code.php</b> on line <b>4</b><br />