CodeIgniter: How to get input from View and use it in the controller

Question

I'm quite new to CodeIgniter (using PHP). So right now I have a textbox on my webpage where visitors are requested to enter in their names. I take in a name (i'll use the variable $username for it) and I want to save it in a database I have. I am wondering how I can do that. Do I somehow pass $username to a function in the Controller and then pass that value to my Model? Thank you very much, a simple example would be much appreciated!!

Answer 1

<form method="post" action="<?php echo base_url();?>controller/save" name="form">
  <label>User Name</label>
  <input type="text" name="Username">   
  <input type="submit" value="Add"/>
</form>

in controller

function save
    {
    $arrData["Username"] = $this->input->post("Username");
    $this->User_model->Add($arrData); 
    } 

in User_model

function Add($arrData) { 
        if($this->db->insert(tableName, $arrData))
          return true;
        else
          return false;
    }