Php pagination problem

I am trying to  make an pagination example.The problem is  sql query .When I try something like this

     $query=$conn->db->prepare("select * from konular limit 3");

Everything is ok code works as intended But When I try something like this nothing happens
   
 $query=$conn->db->prepare("select * from konular limit".$limit.",".$perpage);

 I dont understand what am i doing wrong

<?php
require     "conn.php";
require "funct.php";
$conn=new conn();
$funct=new funct();
$perpage=2;

$totalCount= $funct->total();
$pageCount=ceil($totalCount/$perpage);

$currentPage=isset($_GET["page"])?(int)$_GET["page"]:"1";

if($_GET["page"]<0){
    $_GET["page"]="1";
}else if($_GET["page"]>$pageCount){
    $_GET["page"]=$pageCount;

}
$limit=($currentPage-1)*$perpage;
$query=$conn->db->prepare("select * from konular limit".$limit.",".$perpage);
$query->execute();
$pages=$query->fetchAll(PDO::FETCH_ASSOC);
foreach ($pages as $key => $value) {
    echo $key;
}