multiple select

<!--Controllel-->
          $data = array(
                'kamar' => $this->input->post('kamar',TRUE),
                'isi_max' => $this->input->post('isi_max',TRUE),
                'status' => $this->input->post('status',TRUE),
                'kondisi' => implode(' ',$this->input->post('kondisi',TRUE)),
                'perlengkapan' => $this->input->post('perlengkapan',TRUE)
            );

            $this->Kamar_ikhwan_model->insert($data);


<!--view-->
<select id="kondisi" name="kondisi" class="select2_multiple form-control" multiple="multiple" >
<option value=''>--Pilih--</option>
<option value='AC Bagus'>AC BAGUS</option>
<option value='AC Rusak'>AC RUSAK</option>
<option value='Atap Bagus'>ATAP BAGUS</option>
<option value='Atap Bocor'>ATAP BOCOR</option>
<option value='Kursi Bagus'>KURSI BAGUS</option>
</select>

<!-- Select2 -->
    <script>
      $(document).ready(function() {
        $(".select2_single").select2({
          placeholder: "Select a state",
          allowClear: true
        });
        $(".select2_group").select2({});
        $(".select2_multiple").select2({
          maximumSelectionLength: 10,
          placeholder: "Max. 10!",
          allowClear: true
        });
      });
    </script>
    <!-- /Select2 -->