Need help for .htaccess RewriteRule - .htaccess

Question

I've been trying to setup a RewriteRule for my .htaccess to redirect any not found .php url to my loader.php ... For some reasons, it's redirecting even if the file exist.
Here's what I have:
# Engine On for Extension Removal
RewriteEngine On
# Rewrite the url for the login page
RewriteRule ^login/?$ index.php?tab=login [NC,L]
# Load the url with the page loader if the url doesn't match any of the rule above
RewriteRule ^(.*)\.php$ loader.php?page=$1 [NC,L]
# Remove PHP Extension
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^(.+?)/?$ $1.php [L]
Everything is working before I added this line:
RewriteRule ^(.*)\.php$ loader.php?page=$1 [NC,L]
Right now, no matter what is in my link, even if it exist or not, it'll load the loader.php. And I have other rules like the login one, same thing but different name which is why I didn't bother posting them.

Answer 1

Try
# Engine On for Extension Removal
RewriteEngine On
# Rewrite the url for the login page
RewriteRule ^login/?$ index.php?tab=login [NC,L]
# Remove PHP Extensio
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^(.+?)/?$ $1.php [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)\.php$ loader.php?page=$1 [NC,L]
The problem with
RewriteRule ^(.*)\.php$ loader.php?page=$1 [NC,L]
is that it accepts any .php url in the request and rewrites it to loader.php.
The condition
RewriteCond %{REQUEST_FILENAME} !-f
change this behaviour of the rule, it tells server to process the rule only when there is a request for non existent php file.