Getting insert_id from model sub class

[eluser]blasto333[/eluser]
Superclass Person model

Code:

/*
    Inserts or updates a person
    */
    function save(&$person_data,$person_id=false)
    {        
        if (!$person_id or !$this->exists($person_id))
        {
            return $this->db->insert('people',$person_data);
        }
        
        $this->db->where('person_id', $person_id);
        return $this->db->update('people',$person_data);        
        
    }

Subclass Customer model

Code:

/*
    Inserts or updates a customer
    */
    function save(&$person_data, &$customer_data,$customer_id=false)
    {
        $success=false;
        //Run these queries as a transaction, we want to make sure we do all or nothing
        $this->db->trans_start();
        if(parent::save($person_data,$customer_id))
        {
        
            if (!$customer_id or !$this->exists($customer_id))
            {
//THIS ALWAYS ENDS UP BEING 0 and NOT the insert_id of the row in the person table
                $customer_data['person_id']=$this->db->insert_id();
                $success = $this->db->insert('customers',$customer_data);                
            }
            else
            {
                $this->db->where('person_id', $customer_id);
                $success = $this->db->update('customers',$customer_data);
            }
            
        }
        
        $this->db->trans_complete();        
        return $success;
    }

How can I correctly get the subclass insert id without returning the value from the superclass? (This code worked fine pre php 5.3)

[eluser]blasto333[/eluser]
Problem solved.

[eluser]Ben Edmunds[/eluser]
For future viewers of this thread. You can use insert_id().

Code:

$lastInsertedId = $this->db->insert_id();