สอบถามเรื่อง json การเพิ่มข้อมูลเข้าไปครับ รายละเอียดด้านใน

$data = array(
                            array('Name'=>'parvez', 'Empid'=>11, 'Salary'=>101),
                            array('Name'=>'alam', 'Empid'=>1, 'Salary'=>102),
                            array('Name'=>'phpflow', 'Empid'=>21, 'Salary'=>103)                            );
             

    $results = array(
            "sEcho" => 1,
        "iTotalRecords" => count($data),
        "iTotalDisplayRecords" => count($data),
          "aaData"=>$data);
/*while($row = $result->fetch_array(MYSQLI_ASSOC)){
  $results["data"][] = $row ;
}*/

echo json_encode($results);

<?php
include 'connect.php';


try {

		$column = $db->prepare('SELECT * FROM tbl_extra_media');
		$column->execute();
		$Colcount = $column->columnCount(); //count column 
		//print("result set has $Colcount columns");

		$resultArray = array();

		//get field name
		//$rs = $db->query('SELECT * FROM tbl_result LIMIT 0');
		for ($i = 0; $i < $Colcount; $i++) //$column->columnCount()
		{
    		$col = $column->getColumnMeta($i);
    		$columns[] = $col['name'];
		}
		//print_r($columns);

		while ($row = $column->fetch()) 
		{
			//echo $row['count'];
			$arrCol = array();
			for($i=0; $i<$Colcount; $i++) 
			{
				$arrCol[$columns[$i]] = $row[$i];
			}
			array_push($resultArray, $arrCol);
		}

		$db = null;

		echo json_encode($resultArray);
	}

catch (PDOException $e) {
 echo 'ERROR: ' . $e->getMessage();
}
	?>