php - Radio buttons checked however passing NULL to database -

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i have 4 groups of radio buttons presented unchecked user. user needs check 1 radio button each group. when submit form, error that, example, picture_6.tif value being passed null.

i using codeigniter , form being submitted via post. wonder if tell me i'm doing wrong.

<form action="/log" method="post" accept-charset="utf-8">      <table class="static">          <tbody>              <tr>                  <td><input type="radio" name="picture_6.tif" value="0" class=""></td>                  <td><input type="radio" name="picture_7.tif" value="0" class=""></td>                  <td><input type="radio" name="picture_8.tif" value="0" class=""></td>                  <td><input type="radio" name="picture_9.tif" value="0" class=""></td>              </tr>              <tr>                  <td><input type="radio" name="picture_6.tif" value="1" class=""></td>                  <td><input type="radio" name="picture_7.tif" value="1" class=""></td>                  <td><input type="radio" name="picture_8.tif" value="1" class=""></td>                  <td><input type="radio" name="picture_9.tif" value="1" class=""></td>              </tr>              <tr>                  <td><input type="radio" name="picture_6.tif" value="2" class=""></td>                  <td><input type="radio" name="picture_7.tif" value="2" class=""></td>                  <td><input type="radio" name="picture_8.tif" value="2" class=""></td>                  <td><input type="radio" name="picture_9.tif" value="2" class=""></td>              </tr>              <tr>                  <td><input type="radio" name="picture_6.tif" value="3" class=""></td>                  <td><input type="radio" name="picture_7.tif" value="3" class=""></td>                  <td><input type="radio" name="picture_8.tif" value="3" class=""></td>                  <td><input type="radio" name="picture_9.tif" value="3" class=""></td>              </tr>              <tr>                  <td><input type="radio" name="picture_6.tif" value="9" class=""></td>                  <td><input type="radio" name="picture_7.tif" value="9" class=""></td>                  <td><input type="radio" name="picture_8.tif" value="9" class=""></td>                  <td><input type="radio" name="picture_9.tif" value="9" class=""></td>              </tr>          </tbody>          <tbody>              <tr>                  <td>                      <div>                          <input type="submit" name="mysubmit" value="submit post!">                      </div>                  </td>              </tr>          </tbody>      </table>  </form>

edit: adding make easier searching. error arises using periods in name attribute.

you named radio name="picture_6.tif" , in php parameters available $_post["picture_6_tif"]. note: not $_post["picture_6.tif"]. latter null undefined.

<?php var_dump($_post); ?> //array(5) { ["picture_7_tif"]=> string(1) "1" ["picture_6_tif"]=> string(1) "2" ["picture_8_tif"]=> string(1) "3" ["picture_9_tif"]=> string(1) "9" ["mysubmit"]=> string(12) "submit post!" }

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