将值传递给相同的php文件

I have one php block under html for dropdown list which is under loop.Another php block is for popup window using facebox. Now How by clicking dropdown content pass value to second php block.

<?php


         $msql="select notification_id,applicant_id,notification_dis from app_notification where applicant_id=$app_id order by notification_id desc " ;
        $result_msql=$bd->query($msql);
        while($messagecount=$result_msql->fetch_assoc())

        {
        $not_id=    $messagecount['notification_id'];
        $comment=$messagecount['notification_dis'];


        ?>




            <div  class="comment_ui" >



        <a href="#info"  class='view_comments' rel='facebox' id="<?php echo $not_id; ?>"></br>   <?php echo "check1---$not_id".$comment."";?>
                </a>                  

            </div>

////Another is

      <?php



        echo $_POST['not_id'];  
       $mysql_hostname = "localhost";
      $mysql_user = "root";
      $mysql_password = "";
   $mysql_database = "test";
   $prefix = "";

        $bd = new mysqli($mysql_hostname, $mysql_user,           $mysql_password,$mysql_database) or die("Opps some thing went wrong");


            echo "check2---$not_id";

            $msql_show="select  header_type,notification_main,notification_dis from app_notification where notification_id=$not_id";
            $show_msql=$bd->query($msql_show);

            while($message_show=$show_msql->fetch_assoc())
            {
                $header=$message_show['header_type'];
                $main=$message_show['notification_main'];


            $msql_multi="SELECT file_name FROM biz_logo WHERE    w_id=(SELECT w_id FROM post_job
            WHERE job_id=(SELECT job_id FROM job_notice WHERE 
            notice_id=(SELECT notice_id FROM app_notification where notification_id=$not_id)))";
            }
            $msql_multi=$bd->query($msql_multi);
            while($message_multi=$msql_multi->fetch_assoc())
            {

              $file_name=$message_multi['file_name'];



            }



            print "<center><h1>".$header."$not_id</h1></center>";
    print"<span style='margin-right:50em'><table> 
                 <p><t>".$file_name."</t></p><tr><td>".$main."</td>
    </tr> <tr><td></td></tr></table><span> ";              
            ?>





        <?php }?>

in php manually you can use sessions or if you need

$_SESSION["favcolor"] = "green";
$_SESSION["favanimal"] = "cat";


<?php
// Echo session variables that were set on previous page
echo "Favorite color is " . $_SESSION["favcolor"] . ".<br>";
echo "Favorite animal is " . $_SESSION["favanimal"] . ".";
?>

or if you need use html you can use inputbox and post get method