データベース接続エラー<br>#0 /home/r6174770/public_html/link-dc.com/mail/index.php(15): PDO->__construct()
#1 {main}<br />
<b>Warning</b>:  Undefined variable $db in <b>/home/r6174770/public_html/link-dc.com/mail/index.php</b> on line <b>23</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to a member function query() on null in /home/r6174770/public_html/link-dc.com/mail/index.php:23
Stack trace:
#0 {main}
  thrown in <b>/home/r6174770/public_html/link-dc.com/mail/index.php</b> on line <b>23</b><br />