php - How to use the insert_id() with session to insert into other table? -


i struggling whole day this.

how use insert_id() first insert function in model? tried sessions, couldn't work.

i tried everything.

my first insert looks this:

    $aanbdata = array(         'aanbieding' => $this->input->post('aanbiedingnaam'),         'tekst' => $this->input->post('aanbiedingomschrijving'),         'prijs' => $this->input->post('aanbiedingprijs'),         'conditie' => $this->input->post('aanbiedingconditie'),         'prijssoort' => $this->input->post('prijsopties'),     );           $this->db->insert('aanbiedingen', $aanbdata);

i tried this:

    session_start();     $this->session->set_userdata('aanbiedingid', $this->db->insert_id());

but id runs 1 behind on auto increment, when inserted row id=4 session id=3.

why?

edit:

my model functions:

public function addaanbieding() {     $aanbdata = array(         'aanbieding' => $this->input->post('aanbiedingnaam'),         'tekst' => $this->input->post('aanbiedingomschrijving'),         'prijs' => $this->input->post('aanbiedingprijs'),         'conditie' => $this->input->post('aanbiedingconditie'),         'prijssoort' => $this->input->post('prijsopties'),     );           $this->db->insert('aanbiedingen', $aanbdata);      $this->addimages($image_data, $this->db->insert_id());      $catid = $this->input->post('categorie');        $bedrijfid = $this->session->userdata('idbedrijven');      $bedrijfaanb = array(     'idbedrijven' => $bedrijfid,     'idaanbiedingen' => $this->session->userdata('aanbiedingid'),     'idaanbiedingcat' => $catid     );      $this->db->insert('bedrijfaanbiedingen', $bedrijfaanb);  }  public function addimages($image_data) {     $insert_data = array(         'fotonaam' => $image_data['file_name']     );     $this->db->insert('fotoaanbiedingen', $insert_data);       $fotoid = $this->db->insert_id();     $aanbiedingid = $this->session->userdata('aanbiedingid'); //this nto work      $to_aanbiedingfotos = array(         'idaanbiedingen' => $aanbiedingid,         'idfotoaanbiedingen' => $fotoid     );      $this->db->insert('aanbiedingfotos', $to_aanbiedingfotos); }

you can this:

controller:

$aanbdata['aanbieding'] = $this->input->post('aanbiedingnaam'); $aanbdata['tekst'] = $this->input->post('aanbiedingomschrijving'); $aanbdata['prijs'] = $this->input->post('aanbiedingprijs'); $aanbdata['conditie'] = $this->input->post('aanbiedingconditie'); $aanbdata['prijssoort'] = $this->input->post('prijsopties');  $last_id = $this->model_name->add($aanbdata); //change model_name model name $this->session->set_userdata('name', $last_id);

model: 

function add($data) {    $this->db->insert('aanbiedingen', $data);    return $this->db->insert_id(); }

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