Insert multiple rows data into db

<td>                                        
<select class="form-control show-tick" id="Location Address" name="0[location_address]" title="select location" required autocomplete="off">
<option value="">Select Location Address</option>
</select>                                     
</td>

 <td>
  <div class="dropdown">
  <select class="form-control show-tick" name="0[streams]" id = "streams" data-toggle="dropdown">Select <span class="caret" id="streams"></span></select>
</div>
</td>

<td>
 <div class="dropdown">
   <select class="form-control show-tick" name="0[sub_stream]" id="sub_stream"  data-toggle="dropdown">Select<span class="caret" id="sub_stream"></span>
</select>
</div>
</td>
<td>
<div class="dropdown">
  <select class="form-control show-tick" multiple id="medium" name="0[medium]"  data-toggle="dropdown">Select<span class="caret" id="medium"></span>
</select>
   </div>
</td>

I have written controller where I am trying to insert data. Whenever I am inserting more rows of data it is taking only last row data and inserting into db.

 

Please help me knowing where i am going wrong. I am new to laravel

 

what mean 0[] ??