F6中 php出错求救

youngtrips

启动Apache后，html文件访问正常，但是php文件访问没有反应，日志里信息是
[Wed Nov 14 18:38:18 2007] [error] [client ::1] PHP Warning:  Unknown: failed to open stream: Permission denied in Unknown on line 0
[Wed Nov 14 18:38:18 2007] [error] [client ::1] PHP Warning:  Unknown: Failed opening '/var/www/html/index.php' for inclusion (include_path='.:/usr/share/pear:/usr/share/php') in Unknown on line 0
请问这是什么原因？