PHP 작동 확인

DOCUMENT_ROOT: /var/www/web/frontier/www

_common.php 존재: ✅ 있음

_header.php 존재: ✅ 있음

_footer.php 존재: ✅ 있음

여기까지 뜨면 PHP 정상. 아래에서 _common.php include 시도:

Warning: include_once(./common.php): failed to open stream: No such file or directory in /var/www/web/frontier/www/_common.php on line 2

Warning: include_once(): Failed opening './common.php' for inclusion (include_path='.:/usr/share/pear:/usr/share/php') in /var/www/web/frontier/www/_common.php on line 2

_common.php include 완료

_GNUBOARD_ 정의 여부: ❌ 미정의