php 從 mysql 輸出 圖片

<?php 
session_write_close();
// Include the database configuration file  
if (isset($_GET['Ordersn'])) 
{
    $ordersn=$_GET["Ordersn"];
    
    if(!$dbh = mysqli_connect("localhost", "dbName","PassWord")) {
		die("ERROR: " . mysqli_error());
	}
	mysqli_select_db($dbh, "shopeeprint");
	$str="SELECT image,ordersn,FileName FROM orderPrint WHERE ordersn='$ordersn'";
	//echo($str);
	if(!$res = mysqli_query($dbh,$str )) {
		die("ERROR: " . mysqli_error($dbh));
	}
	$row = mysqli_fetch_assoc($res);
	 
	$data = $row['image'];
	header("Content-Type: image/".pathinfo( $row['FileName'], PATHINFO_EXTENSION));
    echo  $data;
    

} else die("err");