How to get Selected checkbox into database

I have a page for purchase order in that page i show data from table obat and i want to get selected checkbox using that data into table purchase order

This is my table obat

         <table class="table table-bordered" style="margin-top:20px">
             <tbody>
                 <tr class="text-center">
                     <th>No</th>
                     <td>Kode Obat</td>
                     <td>Nama Obat</td>
                     <td>Harga</td>
                 </tr>
                 @foreach ($obat as $key =>$o)
                 <tr>
                     <th class="text-center">
                        @foreach ($po as $po)
                             <input type="checkbox" name="select" id="select">     
                        @endforeach
                    </th>
                     <td>
                        <input type="text" class="form-control" value="">
                    </td>   
                     <td>
                        <input type="text" class="form-control" value="">     
                    </td>   
                     <td>
                         <input type="text" class="form-control" value="">
                     </td>
                 </tr>
                 @endforeach  
             </tbody>
         </table>

The checkbox(select) is from table purchase order but it can't show. if i did't use foreach its show