มีปัญหาในการใช้ PHP เรียกข้อมูล Web Service จาก ASP.net ครับ

<?php
header('content-type: application/json; charset=utf-8');
function returnCustomer()
{
	$objConnect = mysql_connect("localhost","user","password") or die(mysql_error());
	$objDB = mysql_select_db("mydatabase");
	$strSQL = "SELECT * FROM mytable";
	$objQuery = mysql_query($strSQL) or die (mysql_error());
	$resultArray = array();
	while($obResult = mysql_fetch_array($objQuery))
	{
		array_push($resultArray,$obResult);
	}
	mysql_close($objConnect);
	return $resultArray;
}

$data = returnCustomer();
//echo $_GET['callback'] . '('.json_encode($data).')';  //JSONP
echo json_encode($data);//JSON
//echo '{"class":'.json_encode($data).'}';

?>