Saving CSV file

I'm trying to get this code to save a csv file to the root of my hosting accont.

$result = mysql_query("SELECT p.reference AS sku, IFNULL( p.price - sp.reduction, p.price ) AS price, sa.quantity, mpo.asin1 AS 'product-id', 'ASIN' AS 'product-id-type', p.condition AS 'condition-type'
FROM product p
LEFT JOIN specific_price sp
USING ( id_product )
JOIN stock_available sa
USING ( id_product )
JOIN marketplace_product_option mpo
USING ( id_product )
WHERE mpo.asin1 > ''"); 
if (!$result) die('Couldn\'t fetch records'); 
$num_fields = mysql_num_fields($result); 
$headers = array(); 
for ($i = 0; $i < $num_fields; $i++) 
{     
       $headers[] = mysql_field_name($result , $i); 
} 
$csv_filename = "export-amazon.csv";
$fp = fopen($csv_filename, 'w+');


if ($fp && $result) 
{
    fputcsv($fp, $headers);
    while ($row = mysql_fetch_row($result)) 
    {
        fputcsv($fp, array_values($row)); 
    }
}

I've been digging and digging on the internet and nothing seems to work.

In the above code, I know for a fact that the SELECT works perfectly. It just doesn't save a file.

Any ideas, thoughts, anything?? O_o

Thanks,Ron