Why cannot send just one post comment in PHP?

[notfound]

I am trying to write a PHP project.In this site people can share photos by logining and the photos are displayed in the index.php that is the main page of the program.Now I have three database users images and messages.I can provide users to share their photos by saved the information about the photos, and then get them from the database from images table.Now I want to provide a user to make a comment about a photo in the main page.There are textarea and post button under the images.But when I make a comment for an image it is registered not only related picture id but also for the other picture ids.Why does this happen?

Here is the some part of the php code, I also open and close the database connection in the necessary parts.

 while($x < mysql_num_rows($result))
        {   
      $picid=mysql_result($result, $x, 'id');
      $name=mysql_result($result, $x, 'imageName');
      $date=mysql_result($result, $x, 'imageDate');
 
        echo "<div><img src = 'upload/$name' height='300 width='300' /></div>";
        echo "Name: $name   Date: $date";
        echo "<br/>";
       ?>
       <p>Post a Comment</p>
 
      <form action="<?= $_SERVER['PHP_SELF']?>" method="POST">
      <textarea name="message" cols="70" rows="6" placeholder="Enter a comment">
 
     </textarea><br/><br/><br/><br/><br/><br/>
      <input type="submit" name="submit" value="Post" style="float:left"><br/><br/>    
      <br/>
      </form>
     <!--<textarea name="message" cols="70" rows="6" ></textarea><br/><br/><br/><br/>   
     <br/><br/>-->
       <?php
 
        extract($_REQUEST);
        if (isset($submit)) {
          $y=0;
          $email=$_SESSION['email'];
           $asdf = mysql_query("SELECT * from users WHERE email='$email'");
           //var_dump(mysql_error());
            while( $y<mysql_num_rows($asdf) )
           { 
            $iduser=mysql_result($asdf,$y,'id');
             $y++;
          }
 
               echo "$iduser";
               $sql ="INSERT INTO messages (id_user, message,picid) VALUES   
               ('$iduser','$message','$picid');";
 
               $rslt = mysql_query($sql);
 
               if ($rslt== false) {
                echo '<p>Error: cannot execute query</p>';
               }
 
              } ?>
              <?php
 
      $x++;
 
    }

[Rabbit]

One of the reasons is that your insert is inside your loop that you established on line 1.

[notfound]

@Rabbit When I try to write out of of the loop it just take the last picid for all forms.

[Rabbit]

That's because you're pulling your picid from the loop. You need to use the picid that the user put their comment on.