htaccess help in coexisting Codeigniter and Wordpress install

Question

My intention here is to have a codeigniter app with a blog under the same domain. The admin for both should be separate.

The directory structure is this:

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Answer 1

I generally use 2 sets of conditions on the CI .htaccess (one on the root folder)

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^blog/(.*)$ blog/index.php [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]

This will allow the processing of blog URLs first and then deal with the CI URLs. You need to be careful not to have any controllers or routes using the term blog in your application.