fetchAll with PDO::FetchClass returning same object - php

Question

What I'm doing
I'm attempting to get an array of Image objects using the following:
(If I run the raw MySQL query, I am returned 3 distinct rows, all with different values, except for the product_id, obviously.)
$query = 'SELECT * FROM `j_images` WHERE product_id = :product_id';
$stmt = $db_conn->prepare($query);
if($stmt)
{
$I = new \jenis\Product\Image();
$stmt->setFetchMode(PDO::FETCH_INTO, $I);
$result = $stmt->execute(array('product_id'=>$product_id));
if($result)
{
$images = $stmt->fetchAll();
var_dump($images);
}
}
What I Get
An array with 3 jenis\Product\Image objects, but the objects (including references) are identical.
What I expect
An array with 3 \jenis\Product\Image objects, each unique.
Is this because it is fetching into the same object (i.e. $I)? If so, is there a way around this?
However Example 4 in the PHP documentation would lead me to believe that this is possible.
If I follow the example directly from the documentation:
$images = $stmt->fetchAll(PDO::FETCH_CLASS, "\jenis\Product\Image");, I get three separate objects, but all properties are NULL.
Additional Information
Here is a stripped down version of my Image Class:
namespace jenis\Product;
use jenis\DB as DB;
use \PDO as PDO;
class Image
{
public $id;
public $product_id;
public $url;
public static function getImagesByProduct($product_id)
{
… code outlined above …
}
}
The code outlined above is executed as a static method (e.g. Image::getImagesByProduct($product_id);

Answer 1

The reason this wasn't working was because I had developed my constructor so that optional parameters could be passed.
For example:
function __construct($name='', $description='')
{
$this->name = $name;
$this->description=$description;
}
Because the constructor is utilized when FETCH_CLASS is called, this was causing my variables to be NULL, as the properties are not passed as parameters. As #Digital Chris noted, I needed PDO::FETCH_PROPS_LATE which allowed the properties to be set after the constructor was called.