how to store multiple selected dropdown values in database in codeingiter - codeigniter

Question

i have two tables in my database one is requirements another one is users..i have those user names in my requirements form with select box..how to store that user names id in database..
This is my view:
<div class="form-group">
<label>Choose Vendor</label>
<select class="form-control" multiple class="form-control" data-placeholder="user name" name="user_id[]" >
<option value="0"></option>
<?php foreach($user as $rows) { ?>
<option value="<?php echo $rows->user_id?>"><?php echo ucfirst($rows->first_name)?></option>
<?php } ?>
</select>
</div>
This is my controller:
public function requirement()
{
$data["msg"]="";
$this->load->model('RequirementModel');
$data['user']=$this->RequirementModel->getusers();
if($this->input->post())
{
$this->RequirementModel->add_requirement($this->input->post());
redirect(base_url('index.php/Login/dashboard'));
}
$this->load->view('Requirements/requirements',$data);
}
This is my model:
function getusers()
{
$this->db->select('*');
$this->db->from('users');
$query = $this->db->get();
//echo $this->db->last_query();
return $query->result();
}
model add_requirement:
public function add_requirement($data)
{
$data=array('role_name'=>$post['role_name'],'vacancies'=>$po‌​st['vacancies'],'exp‌​erience'=>$post['exp‌​erience'],'jd'=>$pos‌​t['jd'],'hiring_cont‌​act_name'=>$post['hi‌​ring_contact_name'],‌​'hiring_contact_numb‌​er'=>$post['hiring_c‌​ontact_number'],'use‌​r_id'=>$user_id);
$this->db->insert('requirements', $data);
}
how to do this?
Thank you

Answer 1

Change your function add_requirement like below and try;
function add_requirement($data)
{
if(isset($data['user_id']) && !empty($data['user_id'])) {
$data['user_id'] = implode(',',$user_id);
}
$data=array('role_name'=>$post['role_name'],'vacancies'=>$po‌​st['vacancies'],'exp‌​erience'=>$post['exp‌​erience'],'jd'=>$pos‌​t['jd'],'hiring_cont‌​act_name'=>$post['hi‌​ring_contact_name'],‌​'hiring_contact_numb‌​er'=>$post['hiring_c‌​ontact_number']);
$this->db->insert('requirements', $data);
}
}