how to dynamically change the id of a html link with php?

I have links which is on one page and and I sent the links to the database and then on another page I am retrieving the the links from the database. I can only send four links to the database, I made it that way, but I want the four links to have different id's but the ids should be the same even if the user sends different links to the database. for example: if the links are:

<a onclick='cover'>ACCOUNTING</a>
<a onclick='cover'>maths</a>
<a onclick='cover'>english</a>
<a onclick='cover'>ict</a>

the ID's should be something like this:

<a onclick='cover' id='10'>ACCOUNTING</a>
<a onclick='cover' id='11'>maths</a>
<a onclick='cover' id='12'>english</a>
<a onclick='cover' id='13'>ict</a>

even if the links sent are different the ids of the four links should still be 10,11,12 and 13.

here is some of mycode: page1:

if(isset($_POST['English']))
{
  //his is to make the categpories shows show in the maijn page
   headerr("Location:layout.php?userid=${id}&name=${name}&id=1");
 array_push($sub,mysqli_real_escape_string($conn,"<li><a onclick='cover'>ENGLISH</a></li>"));
$plo = implode("",$sub);
 $query = "UPDATE `user` SET `sub`='$plo' WHERE `id` = '$id'"; $clicked = $clicked +1;
 $result = mysqli_query($conn,$query);
 if($result)
 {
  echo "done";
  $name .= 'eng,';
 }
 else{
  echo "not done";
  echo $query;
 }

}
if(isset($_POST['maths']))
{
  headerr("Location:layout.php?userid=${id}&name=math&id=1");
  array_push($sub,mysqli_real_escape_string($conn,"<li><a onclick='cover'>MATHEMATICS</a></li>"));
$plo = implode("",$sub);
   $query = "UPDATE `user` SET `sub`='$plo' WHERE `id` = '$id'"; $clicked = $clicked +1;
 $result = mysqli_query($conn,$query);
 if($result)
 {
  echo "done";
       $name .= 'math,';
 }
 else{
  echo "not done";
  echo $query;
 }
}
if(isset($_POST['accounting']))
{
  headerr("Location:layout.php?userid=${id}&name=accounting&id=1");
  array_push($sub,mysqli_real_escape_string($conn,"<li><a onclick='cover'>ACCOUNTING</a></li>"));
$plo = implode("",$sub);
  $query = "UPDATE `user` SET `sub`='$plo' WHERE `id` =$id"; $clicked = $clicked +1;
 $result = mysqli_query($conn,$query);
 if($result)
 {
  echo "done";
     $name .= 'accounting,';
 }
 else{
  echo "not done";
  echo $query;
 }
}

page2:

<?php 
                      $userid = $_GET['userid'];
        $name =$_GET['name'];
        $cler = explode(',',$name);
        $i= 0;
        $dog =array_filter($cler);

$query ="SELECT sub from user where id = '$userid'";
$result = mysqli_query($conn,$query);
if($row = mysqli_fetch_assoc($result))
{

$t = $row['sub'];
   echo $i;
echo $t;

//this is to change the position of the quetion
}

                       ?>

thanks!!!