当使用post变量删除时，不能取消设置$_SESSION变量

这个页面基本上显示了用户可以选择的DB选项列表的表，一旦选择了用户，就可以删除所选的选项，如果他们犯了错误。我已经删除了所有不必要的东西，使它更容易遵循。我已经尝试了每一种组合来获得一个会话数组元素来取消设置，并且几乎放弃了。我知道张贴的值工作正常，因为我已经让他们在提交表单后返回屏幕。array_search函数似乎不喜欢变量名，如果我用物理值替换$ss_id，我可以让它取消设置ok。

如有任何建议，不胜感激。

<?php require_once('Connections/fs1.php'); 
    if (!isset($_SESSION)) {
      session_start();
    }
    if (!isset($_SESSION['con29']))
    {
    $_SESSION['con29'] = array();
    }
    //db call to get con29 options
    $query1 = mysql_query("SELECT * FROM sub_search_content") or die(mysql_error());
    $_SESSION['main_search_selected'] = 's7';
    $main_search_selected = $_SESSION['main_search_selected'];
    //setup the session variables depending on what was posted------------------
    if (isset($_POST['sub_search_content_id']))//add an option
        {
            $row_id_1 = $_POST['sub_search_content_id']; 
            array_push($_SESSION['con29'],$row_id_1);
        }
    if (isset($_POST['sub_search_content_id_remove']))
    {
        $ss_id = $_POST['sub_search_content_id_remove'];
        $key=array_search($ss_id,$_SESSION['con29']);
        if($key!==false) unset($_SESSION['con29'][$key]);
        //echo $ss_id;
        //echo $key;
    } 
    //print_r ($_SESSION['con29']);
    ?>
    <table width="100%" border="0" cellpadding="0" cellspacing="0">
    <?php

        while ($row = mysql_fetch_assoc($query1)) 
            {

                    $sub_search_id = $_SESSION['con29'];
                    if($row[$main_search_selected] == 1)
                     {
                     $bgcolour = '#ffffff';
                     $select_row ='';
                     $select_row_2='';
                     }
                    elseif($row[$main_search_selected] == 2)
                     {
                         $id = $row['sub_search_content_id'];
                         $key = array_search($id, $sub_search_id);
                         if($key != '')
                                {
                                    $bgcolour = '#AFC137';
                                    $select_row = '<input name="submit" class="push_buttons" type="submit" value="Remove" />';
                                    $select_row_2 = '<input name="sub_search_content_id_remove" type="hidden" id="sub_search_content_id_remove" value="' . $row['sub_search_content_id'] .' " />';  
                                }
                         else
                                {
                                    $bgcolour = '#ffffff';
                                                                    $select_row = '<input name="submit" class="push_buttons" type="submit" value="select" />';
                                    $select_row_2 = '<input name="sub_search_content_id" type="hidden" id="sub_search_content_id" value="' . $row['sub_search_content_id'].'" />';  
                                }
                     }
                     elseif($row[$main_search_selected] == 3)
                     {
                                    $bgcolour = '#FF9900';
                                    $select_row = "Included";
                     }
    //----------------------------------------------------------------------------------------------------------------------------------------------------------------------------

                            if($row[$main_search_selected] != 1)
                            { ?>
                                              <tr bgcolor="<?php echo $bgcolour;?>" >
                                                <form action="test1.php" method="POST" name="form1" id="form1"   >
                                                  <?php echo $select_row_2; ?>
                                                  <td width="60" height="25" align="center" valign="middle" class="top-edge-border-menu"><?php echo $row['sub_search_content_id']; ?></td>
                                                  <td align="center" valign="middle" class="top-and-right-edge-border-left"><?php echo $row['sub_title']; ?></td>
                                                  <td height="25" align="center" valign="middle" class="top-and-right-edge-border">price</td>
                                                  <td height="25" align="center" valign="middle" class="top-edge-border"><?php echo $select_row; ?></td>
                                                </form>
                                              </tr>
                                              <?php }
                     } ?>
                                            </table></td>
                                          </tr>
                                      </tbody>
                                    </table>
    <?php mysql_free_result($query1); ?>