CodeIgniter put email in a global function - codeigniter

Question

I can send an email from within a controller with the example in the CodeIgniter documentation. I was wondering how I would put the email code on a global functions page so I have access to it all over with a simple function call.
// in controller
emailTest($to, $subject, $message);
// on a global functions page
function emailTest($to, $subject, $message) {
$this->load->library('email');
$this->email->from('my#example.com', 'My Name');
$this->email->to($to);
$this->email->subject($subject);
$this->email->message($message);
$this->email->send();
}

Answer 1

You can create a helper and just load it up when you need it.
$this->load->helper('email');
send_email($to, $subject, $message);
Edit: Since you want to use the inbuilt email functionality, libraries would be a better bet:
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class MY_Library {
public function __construct()
{
$this->CI =& get_instance();
}
public function send_email($to, $subject, $msg)
{
$this->CI->load->library('email');
$this->CI->email->from('my#example.com', 'My Name');
$this->CI->email->to($to);
$this->CI->email->subject($subject);
$this->CI->email->message($message);
$this->CI->email->send();
}
}
Then you can call it like so:
$this->load->library('my_library');
$this->my_library->send_email('test#example.com', 'RE: test message','cool message');