WordPress和CodeIgniter htaccess

我在子目录中有一个网站，例如WordPresshttp://example.com/和CodeIgniterhttp://example.com/drinking-water-database/

CodeIgniter URL http://example.com/drinking-water-database/developer可以正常工作。我想drinking-water-database从网址中删除。手段http://example.com/developer将显示的内容http://example.com/drinking-water-database/developer。我已经写了htaccess，但是没有用。

# BEGIN WordPress
# The directives (lines) between `BEGIN WordPress` and `END WordPress` are
# dynamically generated, and should only be modified via WordPress filters.
# Any changes to the directives between these markers will be overwritten.
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} ^developer
RewriteRule "^developer/(.*)/$" "drinking-water-database/index.php?/developer/$1" [L,R=301]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

</IfModule>
# END WordPress

我尝试了所有可能的模式。甚至我只尝试了重定向规则，以使开发人员链接与以下htaccess一起使用。但是http://example.com/developer显示404。

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule "^developer/(.*)/$" "drinking-water-database/index.php?/developer/$1" [L,R=301]
</IfModule>