这条规则：

RewriteCond %{REQUEST_FILENAME} !-f

RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule ^([a-zA-Z0-9-_.]*)$/profile.php?id=$1 [L]

需要在最后.

这条规则：

RewriteCond %{REQUEST_FILENAME} !-d

RewriteCond %{REQUEST_FILENAME}\.php -f

RewriteRule ^(.*)$$1.php

需要[L]标志并需要替换RewriteRule ^([^ /.])$$1.php [L].然后你可以复制这个并用.png和.txt以及你想要处理的每个其他扩展名替换.php,按优先顺序排列：

Options +FollowSymLinks -Multiviews

RewriteEngine on

# Redirect non-www to www:

RewriteCond %{HTTP_HOST} !^www\. [NC]

RewriteRule ^(.*)$http://www.%{HTTP_HOST}/$1 [R=301,L]

# Unless directory, remove trailing slash

RewriteEngine On

RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule ^([^/]+)/$http://www.domain.com/$1 [R=301,L]

# Redirect external .php requests to extensionless url

RewriteCond %{THE_REQUEST} ^(.+)\.php([#?][^\ ]*)?\ HTTP/

RewriteRule ^(.+)\.php$http://www.domain.com/$1 [R=301,L]

# add extension if the php file exists:

RewriteCond %{REQUEST_FILENAME} !-d

RewriteCond %{REQUEST_FILENAME}\.php -f

RewriteRule ^(.*)$$1.php [L]

# add extension if the png file exists:

RewriteCond %{REQUEST_FILENAME} !-d

RewriteCond %{REQUEST_FILENAME}\.png -f

RewriteRule ^(.*)$$1.png [L]

# add extension if the txt file exists:

RewriteCond %{REQUEST_FILENAME} !-d

RewriteCond %{REQUEST_FILENAME}\.txt -f

RewriteRule ^(.*)$$1.txt [L]

# add extension if the html file exists:

RewriteCond %{REQUEST_FILENAME} !-d

RewriteCond %{REQUEST_FILENAME}\.html -f

RewriteRule ^(.*)$$1.html [L]

# etc.

# finally, route to profile.php if all else fails

RewriteCond %{REQUEST_FILENAME} !-f

RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule ^([a-zA-Z0-9-_.]*)$/profile.php?id=$1 [L]

ErrorDocument 404 /404.html

由于您将路由到profile.php,因此在profile.php脚本中,如果id参数不存在,则需要重定向到/404.html(意味着路由的URI必须是404).