master tolong pencerahan nya... saya punya script download bgini :

download.php

<?php

	$dbhost = 'localhost'; 
	$dbuser = 'root';     // ini berlaku di xampp
	$dbpass = '';         // ini berlaku di xampp
	$dbname = 'buku';
 
	// melakukan koneksi ke database
	$connect = new mysqli($dbhost,$dbuser,$dbpass,$dbname);

    $sql = "SELECT * FROM `tbl_valve` WHERE `id` LIKE 'A'";
	$result = $connect->query($sql);
	$row = $result->fetch_assoc();
 
    //header yang menunjukkan nama file yang akan didownload
	header('Content-Disposition: attachment; filename="$row[id]"');
    //header("Content-Disposition: attachment; filename=".$row['id']);
	
    //header yang menunjukkan jenis file yang akan didownload
	header('Content-Type: ".$row[tipe]"');
 
    //header yang menunjukkan ukuran file yang akan didownload
	header('Content-Length: ".$row[$size]"');

   	$fp  = fopen("valve/".$row["id"], 'r');
   	$content = fread($fp, filesize("valve/".$row["id"]));
   	fclose($fp);
    	echo $content;
	exit;

?>

tapi saat saya jalankan muncul error bgini:
Warning: fopen(valve/A): failed to open stream: No such file or directory in C:\xampp\htdocs\perpus\download.php on line 31
Warning: filesize(): stat failed for valve/A in C:\xampp\htdocs\perpus\download.php on line 32
Warning: fread() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\perpus\download.php on line 32
Warning: fclose() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\perpus\download.php on line 33

padahal gambar sudah saya jadikan satu dalam folder, koneksi database juga sudah berhasil. mohon bantuan nya