如果我注释掉另一个，文件中的每一个规则都能很好地工作，但它们两者结合在一起并不能达到任何目的，反而会使网站变得丑陋。关于如何解决这个问题，有什么建议吗？谢谢
Options +FollowSymLinks -MultiViews
# Turn mod_rewrite on
RewriteEngine On
RewriteBase /
# If the request is for a valid directory
RewriteCond %{REQUEST_FILENAME} !-d
# If the request is for a valid file
RewriteCond %{REQUEST_FILENAME} !-f
# If the request is for a valid link
RewriteCond %{REQUEST_FILENAME} !-l
# do not do anything
RewriteRule ^ - [L]
# forward /blog/foo to blog.php/foo
RewriteRule ^blog/(.+)$ blog.php/$1 [L,NC]
# forward /john to user_page/profile.php?name=john
RewriteRule ^((?!blog/).+)$ user_page/profile.php?uid=$1 [L,QSA,NC]
尝试用RewriteRule ^(.+)$替换RewriteRule ^((?!blog/).+)$-无需再次检查blog字符串
我终于明白了。我修改了第二个重写条件，因为第二个改写规则重定向到一个不必要有效的url，即www.example.com/username到看起来像www.example.com/user_page/profile.php?user=username的预期有效url。
我还按照萨法罗夫的建议修改了最后/秒重写规则，它成功了！以下是完整的.htaccess文件。
Options +FollowSymLinks -MultiViews
# Turn mod_rewrite on
RewriteEngine On
RewriteBase /
# If the request is for a valid directory
RewriteCond %{REQUEST_FILENAME} -d [OR]
# OR If the request is for a valid file
RewriteCond %{REQUEST_FILENAME} -f [OR]
# OR If the request is for a valid link
RewriteCond %{REQUEST_FILENAME} -l
# do not do anything
RewriteRule ^ - [L]
# forward /blog/foo to blog.php/foo
RewriteRule ^blog/(.+)$ blog.php/$1 [L,NC]
# forward /john to user_page/profile.php?name=john
RewriteRule ^(.+)$ user_page/profile.php?uid=$1 [L,QSA]