Codeigniter Query Strings URL Issue

You can prepare your config like this:

$config['base_url'] = 'your_base_url';
$config['index_page'] = ''; // empty string
$config['enable_query_strings'] = FALSE; // keep it to default FALSE, you can use it even without enabling it here

and your .htaccess like this:

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

I think that is it, now you can use both segments and query_strings like this:

http://localhost/codeigniter/?c=welcome&m=index
http://localhost/codeigniter/welcome/index
http://localhost/codeigniter/index.php/welcome/index
http://localhost/codeigniter/index.php?c=welcome&m=index
http://localhost/codeigniter/index.php/?c=welcome&m=index

I've already tested both in my environment and it works just fine.

Edit: in my codeigniter template i've extended my core router and slightly changed the _set_routing() method like this:

Of course it is a bad practice to change the core system, so you need to extend the core router file and create MY_Router.php under application/core and make it extend CI_Router like this:

class MY_Router extends CI_Router
{
protected function _set_routing()
{
    if (file_exists(APPPATH.'config/routes.php'))
    {
        include(APPPATH.'config/routes.php');
    }

    if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/routes.php'))
    {
        include(APPPATH.'config/'.ENVIRONMENT.'/routes.php');
    }

    if (isset($route) && is_array($route))
    {
        isset($route['default_controller']) && $this->default_controller = $route['default_controller'];
        isset($route['translate_uri_dashes']) && $this->translate_uri_dashes = $route['translate_uri_dashes'];
        unset($route['default_controller'], $route['translate_uri_dashes']);
        $this->routes = $route;
    }

    $_c = trim($this->config->item('controller_trigger'));
    if ( ! empty($_GET[$_c]))
    {
        $this->uri->filter_uri($_GET[$_c]);
        $this->set_class($_GET[$_c]);

        $_f = trim($this->config->item('function_trigger'));
        if ( ! empty($_GET[$_f]))
        {
            $this->uri->filter_uri($_GET[$_f]);
            $this->set_method($_GET[$_f]);
        }

        $this->uri->rsegments = array(
            1 => $this->class,
            2 => $this->method
        );
    }
    else
    {
        if ($this->uri->uri_string !== '')
        {
            $this->_parse_routes();
        }
        else
        {
            $this->_set_default_controller();
        }
    }
}
}

Now you you have the best of both worlds, you will keep your segments with its goodies untouched but will always look for get c=&m=, i hope its clear enough.

We kept everything to default and made it check for a get request with c and m pretty like what enable_query_strings does but without enabling it and messing anything up to keep working with segments as it is..