How will I display data for select count query on HTML if I am using class in PHP

<?php 
		$count=0;?>
		<table>
			<?php
			foreach($disp as $product) {
				if($count==0){?>
					<tr>
				<?php }
				if($count%3==0 &&$count!=0){?>
					</tr><br><tr>
				<?php }?>
				<td><p><?php echo $product['id'];?></p></td>
				<td>><?php echo $product['cat_id'];?></td>
				<?php $count++;}?>
			</tr>

if(isset($_GET['displayQty'])){
		$disp=$ob->getProductsByCategoryId();
		
	}

<?php
class Products extends DB{
	function __construct(){
		parent :: __construct();
	}
	function getProductdata(){
		$sql="SELECT * FROM tbl_products";
		$data=$this->selectDataQuery($sql);
		return $data;
	}
	function getProductsByCategoryId(){
		//$id=$_GET['displayQty'];
   		$sql = "SELECT COUNT(*) AS total_products FROM tbl_products WHERE cat_id=".$_GET['displayQty'];  
   		
   		
   		$query=$this->getCntForProducts($sql);
   		


   		return $query;
   		
   }	
}
		

	

<pre>parent classs code

function getCntForProducts($sql,$type="assoc"){
		$result=mysqli_query($this->conn,$sql);
		if($type=='assoc')
		{
			$disp = $this->getQurData($result);
		}
		else{
			echo "error";
		}
		return $disp;
	}



	function getQurData($result)
	{
		$i =0;
		$arr = array();
		while($disps = mysqli_fetch_assoc($result))
		{	

			$arr[$i] = $disps;
			$i++;
		}
		return $arr;
	}
}parent class code