How to select from 2 different table and insert to 1 table - php

Question

I have a function is select from books table insert to the orders table.
Now I want to select from books and users table for insert to the orders table.
This is book table
This is the orders table
This is the users table
model
public function history($book_id){
$this->db->select('book_id,book_title,pickup,return');
$this->db->from('books');
$this->db->where('book_id', $book_id);
$query = $this->db->get();
if ( $query->num_rows() > 0 ) // if result found
{
$row = $query->result_array();
foreach($row as $values){
$data = array(
'book_id' => $values['book_id'],
'title' => $values['book_title'],
'pickup' => $values['pickup'],
'return_time' => $values['return'],
);
$this->db->insert('orders', $data);
}
return true;
}
else{
return false;
} }

Answer 1

You will join the tables like this
$this->db->join('users_table_name', 'users_table_name.id = books.user_id');
Everything else should work the same

Answer 2

for user_id u can get from session,
for example :
$data = [
'book_id' => $values['book_id'],
'user_id' => $this->session->userdata('session_name'),
'title' => $values['book_title'],
'pickup' => $values['pickup'],
'return_time' => $values['return'],
];
hopes this helps

Answer 3

public function insert_record($book_id, $user_id) {
$book = $this->db->select('book_id, book_title, pickup, return')
->from('books')
->where('book_id', $book_id)
->get()
->result_array();
if(!empty($book)) {
$data = array(
'book_id' => $book[0]['book_id'],
'user_id' => $user_id,
'title' => $book[0]['book_title'],
'pickup' => $book[0]['pickup'],
'return_time' => $book[0]['return'],
);
$this->db->insert('orders', $data);
}
}