htaccess forward all users to a single file - php

Question

Good day,
I am using a framework that uses a .htaccess file to forward all requests to a sub file core/index.php
I used the following .htaccess file code :
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteRule ^$ core/ [L]
# If the request is not for a valid directory
RewriteCond %{REQUEST_FILENAME} !-d
# If the request is not for a valid file
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule (.*) core/$1 [L]
</IfModule>
This worked great I thought until I noticed that the pages got loaded multiple times.
And this is what I want to prevent.
So I had a little look at this forum.
And I found a solution that the space between (.*) and core could be the reason.
Hence I removed it.
And to my delight the multiple db inserts stopped.
However now I have found that my requests do not get forwarded correctly.
Only the main request (www.myapplication.com/) gets forwarded correctly (index.php)
Whenever I am adding something like : (www.myapplication.com/admin) he bugs out and cannot find the page.
I hope anyone could tell me what to modify in this code :
RewriteEngine on
RewriteRule ^$ core/ [L]
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule (.*) core/$1 [L]
Thanks in advance!!
I also note that whenever I change the (.) core/$1 [L] line to (.)core/$1 [L] that not only my (sub)pages stopped working but for the index.php the load times of my index.php file where split in half.
Hence my page truly gets reloaded multiple times.
Edit
As pointed out by a question below the system also uses a .htaccess file inside the /core directory.
This file has the following contents
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
# Rewrite all other URLs to index.php/URL
RewriteRule ^(.*)$ index.php?url=$1 [PT,L]
</IfModule>
<IfModule !mod_rewrite.c>
ErrorDocument 404 index.php
</IfModule>
Edit
I think it would come handy to make a small summary. If requested for a file or path I want the server to check if it is
available on the server.
www.myapplication.com/flower.jpeg and the server can find it it should display the flower.jpeg file.
If the server CAN NOT find the flower.jpeg file I want the server to forward the request to /core/index.php?url=flower.jpeg
I am using two .htaccess files
in the **public directory** (main directory)
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteRule ^$ core/ [L]
# If the request is not for a valid directory
RewriteCond %{REQUEST_FILENAME} !-d
# If the request is not for a valid file
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule (.*) core/$1 [L]
RewriteCond %{REQUEST_URI} !core/
</IfModule>
Second file in the core directory
core/
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
# Rewrite all other URLs to index.php/URL
RewriteRule ^(.*)$ index.php?url=$1 [PT,L]
</IfModule>
<IfModule !mod_rewrite.c>
ErrorDocument 404 index.php
</IfModule>
The issue: my pages are in a loop hence the page index.php get's executed with every server request. E.G. 10 images on a page means 10
requests extra. Same for js and CSS files.
edit:
Solved!!!
This is the solution!!
DirectoryIndex core/index.php
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ core/index.php?url=$1 [QSA,L]
</IfModule>

Answer 1

You have to add
RewriteCond %{REQUEST_URI} !core/
to the RewriteCond block to prevent redirection from the target to the target.
It would be better if your target would be more specific, for example if you could specify /core/ instead of core/ (do you have a core subfolder in every folder?). Also, you will have to exclude image folders.

Answer 2

Try this in /core/.htaccess:
ErrorDocument 404 default
DirectoryIndex index.php
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([^.]+)/?$ index.php?url=$1 [QSA,L]

Answer 3

I found a solution. The working code is :
DirectoryIndex core/index.php
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ core/index.php?url=$1 [QSA,L]
</IfModule>