Broken PHP if-elseif statement

I am working on a personal project and I'm trying to create a php script to display a follow button if the logged in session user doesn't already follow the user displayed..

Heres what I've got:

<?php
      $query = query("SELECT*FROM following, users WHERE followed_id=" .escape_string($_GET['id'])." 
      AND user_id=".escape_string($_GET['id'])." AND follower_id =".escape_string($_SESSION['user_id'])."");
      confirm($query);
      while($row = fetch_array($query)):

       if(mysqli_num_rows($query)==0){

         $followbutton=<<<DELIMITER

       <form method="post" action="">
         <input type="hidden" name="followed" value="{$row['user_id']}">
         <input type="hidden" name="follower" value="{$_SESSION['user_id']}">
         <input class="btn btn-info" type="submit" name="submit" value="follow">
       </form>

DELIMITER;
       echo $followbutton;

    }elseif($row['follower_id'] == $_SESSION['user_id']){
      $unfollowbutton=<<<DELIMITER

    <form method="post" action="unfollow.php?id={$row['user_id']}">
      <input class="btn btn-info" type="submit"  value="Unfollow">
    </form>

DELIMITER;
    echo $unfollowbutton;

  }
endwhile;    ?>

Here's what query, escape_string, fetch_array and confirm do:

function redirect($location){
header("Location: $location");
}

function query ($sql){
global $connection;
return mysqli_query($connection,$sql);
}

function confirm($result) {
global $connection;
if(!$result){
    die("QUERY FAILED ".mysqli_error($connection));
}
}

function escape_string($string){
global $connection;
return mysqli_real_escape_string($connection,$string);
 }

 function fetch_array($result) {
return mysqli_fetch_array($result);
}

The following table only has two columns; followed_id and follower_id. When the user clicks the follow button it passes the logged in user_id as the follower_id and the user_id for the person being followed as the followed_id. Since there wont be any entries if user A hasn't already followed user B I need the button to display only if no results are returned from the query.