Php PDO - data retrieval issue

<?php


	$db_host = "localhost";
	
	$db_name = "Office_E";
	$db_user = "root";
	$db_pass = "";
	
	try{
		
		$con = new PDO("mysql:host={$db_host};dbname={$db_name}",$db_user,$db_pass);
		$con->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
	}
	catch(PDOException $e){
		echo $e->getMessage();
	}


?>

<pre>?php
include 'config.php';

## Read value
$draw = $_POST['draw'];
$row = $_POST['start'];
$rowperpage = $_POST['length']; // Rows display per page
$columnIndex = $_POST['order'][0]['column']; // Column index
$columnName = $_POST['columns'][$columnIndex]['data']; // Column name
$columnSortOrder = $_POST['order'][0]['dir']; // asc or desc
$searchValue = $_POST['search']['value']; // Search value

## Search 
$searchQuery = " ";
if($searchValue != ''){
	$searchQuery = " and (emp_no like '%".$searchValue."%' or 
        first_name like '%".$searchValue."%' or 
        last_name like'%".$searchValue."%' ) ";
}

## Total number of records without filtering - PDO style
// Count Total Records in the table
$totalRecords = $con->query("SELECT count(*) from employees")->fetchColumn();

## Total number of records with filtering - PDO Style
$totalRecordwithFilter = $con->query("SELECT count(*) from employees WHERE 1 ".$searchQuery)->fetchColumn();

## Fetch records - PDO style
$data = array();
// bind values..
$stmt = $con->prepare("select * from employees WHERE 1 ".$searchQuery." order by ".$columnName." ".$columnSortOrder." limit ".$row.",".$rowperpage;);
//$stmt->bindParam(1, $start,PDO::PARAM_INT);
//$stmt->bindParam(2, $end,PDO::PARAM_INT);
$stmt->execute();
$data1 = $stmt->fetchAll();

if ($stmt->fetchcolumn() > 0)
{
     
        foreach ($data1 as $row) {
        $data[] = array (
			"emp_no"=>$row['emp_name'],
    		"first_name"=>$row['first_name'],
    		"last_name"=>$row['last_name'],
    		"gender"=>$row['gender'],
    		"hire_date"=>$row['hire_date']
    	);
}
    unset($data1);
    
}