How to get site url of the codeigniter.You can use this method in the controller,model and view files.
First, you have to call this URL Helper file.

$this->load->helper('url');

// this is get from config file.
base_url();
or
// this is also get from config file.
site_url();
or
// core php server variables
$_SERVER{'DOCUMENT_ROOT'}

Also you can use following script to get site url in view files.

 echo site_url('buyer/editProfile/50');
// output like this.
//http://www.mysite.com/buyer/editProfile/50