Default Controller not loading after rerouting - codeigniter

Question

I have a codeigniter multistie install where I have such code that I can serve sites with such links
site.com/sites/sitename/controller/function/vars
site.com/controller/function/vars/
subdom.site.com/controller/function/vars
the challange is that , whith the routing
$route['sites/([^/]+)/(.*)'] = '$2';
$route['default_controller'] = "content";
I get working the links like
site.com/sites/sitename/controller/function/vars
site.com/controller/function/vars
By idea when I go to
www.site.com/sites/sitename/
the default controller is not loading.
I made the config.php so that regarding the link structure, when I visit link
site.com/sites/sitename/controller/function/vars
then
$config['base_url']="http://site.com/sites/sitename";
if I go to
site.com/controller/function/vars
then
$config['base_url']="http://site.com/";
for the second case the default controller loads perfectly. For the subsite case not/
I get just 404
What to do?
UPDATE 2:
I have a multifolder setup.
When user goes to www.site.com/sites/site_name
then a folder of application
/root_folder/usersites/site_name is loaded.
When user goes just site.com/controller/function/var1/var2
a default application folder which is
/root_folder/application is loaded
when user goes to sub1.site.com application folder
/root_folder/domains/sub1_site_com is loaded
So when I enter in address bar
http://site.com/sites/site_name
it should be like no URI. and should load default controller.
// Application folder loading code
$myApp = '';
if($_SERVER['SERVER_ADDR']=='127.0.0.1'){
$main_url='site.com';
}
else{
$main_url='site1.com';
}
//echo $main_url;
switch($_SERVER['HTTP_HOST'])
{
case $main_url;
$uri_string=$_SERVER['REQUEST_URI'];
$link_way=explode('/',$uri_string);
if(strlen($uri_string)>6 and $link_way[1]=='sites' ){
//print_r($link_way);
//var_dump($link_way);
//checking if the link goes to usersites and sitename is bigger and =5
if($link_way[1]=='sites' and strlen($link_way[2])>=5){
$myApp='sites/usersites/'.$link_way[2];
define('SITE_ALIAS','1|'.$link_way[2]);
}
elseif($link_way[1]=='sites' and strlen($link_way[2])<5){
exit('Username should be more than 4 chars');
}
}
else{
define('SITE_ALIAS','0|'.str_replace('.','_',$_SERVER['HTTP_HOST']));
$myApp = 'application';
}
break;
default:
$myApp = str_replace('.','_',$_SERVER['HTTP_HOST']);
$myApp=str_replace('www_','',$myApp);
define('SITE_ALIAS','2|'.$myApp);
$myApp='sites/domains/'.$myApp;
}
$application_folder = $myApp;

Answer 1

What you appear to be doing is looking for a controller with the 'sitename' you are passing through. So if you navigate to site.com/sites/my-site/ you route tells it to look for a controller called my-site and run the index method.
The value of the route should be a path to an actual controller / method pair.
$route['sites/([^/]+)/(.*)'] = '$2';
should be
$route['sites/([^/]+)/(.*)'] = 'sites/index/$1/$2';
This is assuming it's the index method that accepts the sitename as it's first parameter in your sites controller.

Answer 2

It's not totally clear what you're asking, but heres a shot:
You need to create an .htaccess file in the root of your site (i.e. in the same folder that your system folder is in). In that file:
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond $1 !^(index\.php)
RewriteRule ^(.*)$ index.php/$1 [L]
</IfModule>
See the "Remove the index.php file" section of this page: http://codeigniter.com/user_guide/general/urls.html for more info.
Also, the route that you're using would make it so that when you go to www.site.com, you will see www.site.com/sites/content.
With the url www.site.com/sites/sitename/content/, sites is your controller, sitename the method or function, and content would be considered a parameter to the sitename function -- this won't work like it seems like you want, but I can't be sure without seeing your controller.
Maybe edit your question and add your controller(s), and we can be of more assistance.
UPDATE:
1: $config['base_url'] has nothing to do with routing or which controller is being used, so this is making your question harder to understand.
2: It isn't clear what you are trying to accomplish (sorry).
By idea when I go to
www.site.com/sites/sitename/
the default controller is not loading.
According to the CI user guide:
CodeIgniter can be told to load a
default controller when a URI is not
present, as will be the case when only
your site root URL is requested. To
specify a default controller, open
your application/config/routes.php
file and set this variable:
So, what this means is that the default_controller is used only when there is no URI present. In other words: the default controller only applies when the URL is www.site.com, and in no other case will it be used (unless you are using sub-folders in the controllers folder -- see below).
If you trying to make it so that each of your sites has its' own controller, you could use subfolders in your controller folder.
In routes.php:
$route['sites/(:any)'] = "$1";
$route['default_controller'] = "content";
Then your folder structure:
So you have your controller folder. In it, create a folder for each site. In each of those controllers create your default controller (named content.php in the above image).
With this setup, www.site.com/sites/site1 will call the default controller (content) from application/controllers/site1/content.php and show the index function of that controller.
If you then want to call other functions of the site1 controller, the URL would look like:
www.site.com/sites/site1/content/otherFunction.
Hope this helps.

Answer 3

$uri_string=$_SERVER['REQUEST_URI'];
$way=explode('/',$uri_string);
/// print_r($way);
//echo $way[3];
if($way[1]=="sites" and strlen($way[2])>2 and strlen($way[3])<1){
echo "JAJA ";
$route['sites/:any'] = "content/show_page/home";
}
else{
$route['sites/([^/]+)/(.*)'] = '$2';
}
this was solution. thanks all who answered. thanks stormdrain. you pointed me to a write direction in your routing example. Thanks