如何保存多个路径不同的文件上传？

Question

我在表单中上传了3个文件，但是只能在数据库和路径文件夹中保存一个文件。

类Pegawaimagang_model扩展了CI_Model {     私人$ _table =“ pegawaimagang”;

public $id;
public $id_magang;
public $status;
public $username;
public $password;
public $nama;
public $email;
public $notelp;
public $cv;
public $ktp;
public $suratmagang;
public $foto;

public function daftarmagang()
{
    $post = $this->input->post();
    $this->id = uniqid();
    $this->id_magang = $post['id_magang'];
    $this->nama = $post["nama"];
    $this->email = $post["email"];
    $this->notelp = $post["notelp"];
    $this->ktp = $post["ktp"];
    $this->status = 1;
    $this->username = "";
    $this->password = "";
    $this->suratmagang = $this->_uploadSuratMagang();
    $this->foto =$this->_uploadFoto();
    $this->cv = $this->_uploadCV();
    $this->db->insert($this->_table, $this);
}

private function _uploadFoto()
{
    $config['upload_path']          = './upload/pegawaimagang/foto/';
    $config['allowed_types']        = 'gif|jpg|png';
    $config['file_name']            = $this->id;
    $config['overwrite']            = true;
    $config['max_size']             = 2048; 
    $this->load->library('upload', $config);

    if ($this->upload->do_upload('foto')) {
        return $this->upload->data("file_name");
    }

    return "default.jpg";
}
private function _uploadCV()
{
    $config['upload_path']          = './upload/pegawaimagang/cv/';
    $config['allowed_types']        = 'pdf';
    $config['file_name']            = $this->id;
    $config['overwrite']            = true;
    $config['max_size']             = 2048; 
    $this->load->library('upload', $config);

    if ($this->upload->do_upload('cv')) {
        return $this->upload->data("file_name");
    }

    return "default.pdf";
}
private function _uploadSuratMagang()
{
    $config['upload_path']          = './upload/pegawaimagang/suratmagang/';
    $config['allowed_types']        = 'pdf';
    $config['file_name']            = $this->id;
    $config['overwrite']            = true;
    $config['max_size']             = 2048;

    $this->load->library('upload', $config);

    if ($this->upload->do_upload('sm')) {
        return $this->upload->data("file_name");
    }

    return "default.pdf";
}

}

我希望将所有输​​入文件中的所有数据保存到我的数据库中，并将文件保存到不同的路径文件夹中，但是我只能将一个文件保存在一个文件夹中。