Change public_html directory .htaccess - apache

Question

My folder for public_html is /domain.com/public_html/ but i want the htaccess to redirect them to the folder /domain/public_html/www/ but still have domain.com as domain and not domain.com/www .
EDIT:
I want the subfolder www in the public_html do be the default root and not public_html itself
Any solution on this?
Here is my current htacess
Options +FollowSymlinks
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^(.*)$ $1.php
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^(.*)$ www/$1 [NC,L]
</IfModule>

Answer 1

If you can only go for .htaccess, this simple one should do it;
RewriteEngine on
RewriteCond %{REQUEST_URI} !^/www/
RewriteRule ^(.*)$ /www/$1 [QSA]
Explanation;
RewriteEngine on # Turn on mod_rewrite functionality
RewriteCond %{REQUEST_URI} !^/www/ # Don't rewrite requests that are
# already to the /www/ directory.
# If this isn't here, we'll go into
# a neverending loop.
RewriteRule ^(.*)$ /www/$1 [QSA] # Rewrite all else to the www subdirectory
# QSA = keep the query string.
EDIT: Didn't see your existing htaccess, this (minus the redundant RewriteEngine statement) should probably go at the end instead of the whole IfModule block.

Answer 2

Try to put this in the htaccess on the public_html folder:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^(.*)$ www/$1 [NC,L]
</IfModule>
OR
Edit the apache configuration (httpd.conf)
vi /usr/local/apache/conf/httpd.conf
and set the DocumentRoot of the domain as
DocumentRoot /home/user/public_html/www
Save the file and restart the httpd service.
OR (recomanded)
Take a look at this question(and it's answer) - https://stackoverflow.com/a/5891858/1361042
EDIT
Use this HTACCESS:
<IfModule mod_rewrite.c>
Options +FollowSymlinks
RewriteEngine On
RewriteCond %{REQUEST_URI} !^/www/
RewriteRule ^(.*)$ www/$1 [NC, QSA]
</IfModule>
don't add it to yours but replace your htaccess with this one.