Associative array's loaded from database and display as 'columns' - php

Question

I am trying to create an overview of product properties, for an invoice system.
So far, most things are comming together using classes and PDO.
I have the following issue.
In my class, i've created a function that builds my products array.
It loads some information from the database, to build this array.
This array, i want to use to display all the products i have selected:
$prod1 - $prod1Name - $prod1Descr - $prod1Price
$prod2 - $prod2name - $prod2Descr - $prod2Price
etc.
I figured that the Associative array would help me creating columns.
Though the problem is, that i do not understand a bit how to create multiple lines and columns this way.
I was thinking of something like:
$prod[1]["name"] - $prod[1]["descr"] - etc
Then to use this in a foreach loop to create as many new lines as required.
The only thing i could come up with is on my index.php (as shown below), cause using an index (the [1] defenition) does not seem to work the way i think it should be implemented.
For my understanding, i assigend the var in my class as an array, then redefine an array when loading the database information.
Could anyone tell me how i could try to solve this issue?
I have the following class:
<?
class Invoice{
var $vendorID;
var $product = array();
function product_array(){
global $db;
$query = $db->conn->prepare('
SELECT ProductName, ProductDescription, ProductDuration, ProductPriceInclVat, ProductPriceExclVat, ProductVatType
FROM products WHERE VendorID = :VendorID
');
$array = array (
'VendorID' => $this->vendorID
);
$query->execute($array);
$result = $query->fetchall();
if (empty($result)){
echo"Could not find any products matching your criteria.";
die;
} else {
foreach($result as $row) {
$this->product = array("Name" => $row['ProductName'],
"Description" => $row['ProductDescription'],
"Duration" => $row['ProductDuration'],
"PriceExclVat" => $row['ProductPriceExclVat'],
"PriceInclVat" => $row['ProductPriceInclVat'],
"VatType" => $row['ProductVatType']
);
}
}
}
}
?>
and then i have the following code on my index.php:
<?
$invoice = new Invoice();
foreach ($invoice->product as $key => $value){
echo $key . "<br>";
echo $value . "$value";
echo "<br>";
}
?>

Answer 1

When you are assigning the result arrays to the product property you are overwriting the array every time. You need to append to the array instead, so something like:
$this->product = array();
foreach($result as $row) {
$this->product[] = array(...);
}
Alternatively, you could just assign the results of fetchAll to the product property if you don't need to rename the field keys (or you could alias them in the SQL).

Answer 2

$query = $db->conn->prepare('
SELECT ProductName as Name,
ProductDescription as Description,
ProductDuration as Duration,
ProductPriceInclVat as PriceInclVat,
ProductPriceExclVat as PriceExclVat,
ProductVatType as VatType
FROM products WHERE VendorID = :VendorID
');
$array = array (
'VendorID' => $this->vendorID
);
$query->execute($array);
$product = $query->fetchall(PDO::FETCH_ASSOC);
The $product is now in the format you require.
After this you can avoid foreach loop in class invoice.
Other thing i noticed that you have made function product_array() which is not called,
so in index.php you are getting empty array (defined in class Invoice).
So in Invoice class it should be
$product = product_array()
and product_array function should return the value.