PHP 에러

(해당 에러때문에 생기는 큰 문제는 없어 보입니다만...) apache 서버 로그에 아래와 같은 지속적인 에러가 기록됩니다. 글을 작성할때 로깅 되는 것 같은데, 확인해 주시기 바랍니다.

[Wed Oct 13 00:24:49 2010] [error] [client ...] PHP Notice: Use of undefined constant title - assumed 'title' in /home/.../write_update.php on line 2, referer: http://.../write.php?...
[Wed Oct 13 00:24:49 2010] [error] [client ...] PHP Stack trace:, referer: http://.../write.php?...
[Wed Oct 13 00:24:49 2010] [error] [client ...] PHP 1. {main}() /home/.../write_update.php:0, referer: http://.../write.php?...
[Wed Oct 13 00:24:49 2010] [error] [client ...] PHP Notice: Undefined variable: wr_subject in /home/.../write_update.php on line 2, referer: http://.../write.php?...
[Wed Oct 13 00:24:49 2010] [error] [client ...] PHP Stack trace:, referer: http://.../write.php?...
[Wed Oct 13 00:24:49 2010] [error] [client ...] PHP 1. {main}() /home/.../write_update.php:0, referer: http://.../write.php?...