PHP else statement not executing - php

Question

My else statement is not getting executed when it should. There are no errors in the code. It simply has to do with the flow of my query and foreach statement but I cannot seem to figure this out. Any ideas?
$id = $this->input->post('id');
$session_id = $this->input->post('session_id');
$q1 = $this->db->query("SELECT *
FROM default_cart
WHERE cookie_id = '$session_id'
AND product_id = '$id' LIMIT 1");
foreach($q1->result() as $row) {
if($row->cookie_id != $session_id && $row->product_id != $id) {
echo json_encode(array('error_code' => 'e100'));
} else {
$data = array('product_id' => $id,
'active' => 'Yes',
'cookie_id' => $session_id
);
$this->db->insert('default_cart', $data);
echo json_encode(array('success' => true));
}
}

Answer 1

First, I would like to suggest that there is no sense of looping through the query when there is only one record LIMIT 1 and no sense of if check while you have already checked the all parameters in the query WHERE cookie_id = '$session_id' AND product_id = '$id' just fetch the row returned by the query and check for empty or not.
$id = $this->input->post('id');
$session_id = $this->input->post('session_id');
$q1 = $this->db->query("SELECT * FROM default_cart
WHERE cookie_id = '$session_id' AND product_id = '$id' LIMIT 1");
$row=$q1->row();
if(!empty($row)) {
$data = array('product_id' => $id,
'active' => 'Yes',
'cookie_id' => $session_id);
$this->db->insert('default_cart', $data);
echo json_encode(array('success' => true));
}else{
echo json_encode(array('error_code' => 'e100'));
}