Codeigniter get mysql value - php

Question

Can someone please guide me how I can fetch mysql row's value for "pk" to the $response variable to be able to allow the script to unfollow users automatically. I have already tried the script and it does unfollow when an pk id is provided but I want to automatically fetch it from mysql to be able to run it. Thank you for any help provided.
These are the methods I tried with no success:
$this->db->select('pk');
$this->model->from(INSTAGRAM_FOLLOW_TB);
$this->db->where("id = '11'");
$query1 = $this->db->get();
$result = $query1->result();
Main ID that only unfollow this ID- created by Mushfik Media,
$response = $i->unfollow($result);
I have also tried
$accounts = $this->model->fetch("*", INSTAGRAM_ACCOUNT_TB, "id = '11'");
$response = $i->unfollow($accounts->pk);
But didn't work. $NEED MYSQL DATA VALUE is where the value is supposed to be echoed but doesn't
case 'unfollow':
try {
$result = $i->getSelfUsersFollowing();
if(!empty($result) && $result->status == "ok" && !empty($result->users)){
$response = $i->unfollow($NEED MYSQL DATA VALUE);
$response = $response->status;
$CI =& get_instance();
$CI->load->model('Schedule_model', 'schedule_model');
$lang = $CI->db->insert(INSTAGRAM_FOLLOW_TB, array(
"pk" => $row->pk,
"name" => $row->username,
"type" => $data->schedule_type,
"uid" => $data->uid,
"account_id" => $data->account,
"account_name" => $data->name,
"created" => NOW
));
}
} catch (Exception $e){
$response = $e->getMessage();
}
break;

Answer 1

Maybe something like this to get your pk:
$query1 = $this->db->select('pk')
->from(INSTAGRAM_FOLLOW_TB)
->where('id', 11)
->get();
if( $query1->num_rows() == 1 ){
$row = $query1->row();
$response = $i->unfollow( $row->pk );
}
Regarding your information that you are trying to use $this when not in object context, because you are in a helper, you need to get the CI super object. So, if you were trying to use $this->db, you would do this:
$CI =& get_instance();
// Now you can use $CI->db
// and anything you would normally
// access via $this in a controller
// or model
OK, finally to show an example of how to order or limit a query:
$query1 = $this->db->select('pk')
->from(INSTAGRAM_FOLLOW_TB)
->where('id', 11)
->order_by('your_timestamp_field', 'ASC') // This would order by timestamp in ascending order
->limit(1) // This would limit to a single row
->get();