Use multiple SQL queries to output into CSV format using PHP - php

Question

having some issues outputting some SQL queries into CSV format. I can successfully do one query and write it to CSV, but I need to do a query within a query and I get that awesome infinite loop. Here's what I have so far
header( 'Content-Type: text/csv' );
header( 'Content-Disposition: attachment;filename='.$filename);
$fp = fopen('php://output', 'w');
$result = mysqli_query($conn, "SELECT * FROM Customers")
or die("Error: ".mysqli_error($conn));
$row = mysqli_fetch_assoc($result);
if($row) {
fputcsv($fp, array_keys($row));
// reset pointer back to beginning
mysqli_data_seek($result, 0);
}
while($row = mysqli_fetch_assoc($result)) {
$orderResult = mysqli_query($conn,"SELECT * FROM Orders WHERE order_No = '".$row['customer_ID']."'")
or die("Error: ".mysqli_error($conn));
$rowOrder = mysqli_fetch_assoc($orderResult);
fputcsv($fp, array_keys($rowOrder));
mysqli_data_seek($result, 0);
$rowOrder = mysqli_fetch_assoc($orderResult);
fputcsv($fp, $row);
fputcsv($fp, $rowOrder);
}
fclose($fp);
The output i'm trying to achieve is:
Display customer header info in this row a.k.a first name, surname, email
next row displays info about customers e.g Tony, Mcguire, tony#b.c
Display Tony's order header info e.g order number, order date
display Tony's order info e.g 5122, 6/3/2013
If I can get it all to display into 2 rows, that'd be even better.

Answer 1

This can be cleaned up a lot. If I'm understanding you right, you want to generate a report where row 1 is the header and each row after is customer/order data. This is an example I came up with:
$sql = "SELECT c.*, o.* FROM Customers AS c
JOIN Orders AS o ON c.CustomerID = o.CustomerID";
$result = mysqli_query($conn, $sql);
$i = 1;
while($row = mysqli_fetch_assoc($result)) {
if ($i == 1) {
// this is the header
fputcsv($fp, array_keys($row));
$i++;
}
// this is the customer/order data
fputcsv($fp, $row);
}
You can specify which database fields you want to include by replacing the c.* with the customer fields (c.name, c.address, etc) and the o.* with your order fields (o.orderid, o.date, etc)