some images missing after implementing RewriteRule - php

Question

I have been working on this issue for what feels like endless hours, but I feel like I'm really close to solving it.
I have stripped my site down to the bare minimum code to troubleshoot this, and I think I have found the line that is causing me trouble, but I just don't know WHY it is causing me trouble. Here is my code as it is now:
//display all products
if (!isset($_GET['id'])) {
$result = mysqli_query($link, "SELECT products.*, company.company-name FROM products INNER JOIN company ON products.company-id=company.id");
if (!$result) {
echo 'Error';
exit();
}
}
//display one product
if (isset($_GET['id'])) {
$id = $_GET['id'];
$get_item_info = mysqli_query($link, "SELECT products.*, company.company-name FROM products INNER JOIN company ON products.company-id=company.id WHERE products.id='$id'");
$row = mysqli_fetch_assoc($get_item_info);
if (!$row) {
echo 'Error';
exit();
}
$company_name = $row['company-name'];
$model_abbreviation = $row['model-abbreviation'];
if ($row['model-version'] == NULL) { $image_directory_name = "$company_name/$model_abbreviation/"; } else $image_directory_name = "$company_name/$model_abbreviation (" . $row['model-version'] . ")/";
}
if (!isset($_GET['id'])) {
$group = array();
while ($row = mysqli_fetch_assoc($result)) {
$group[ $row['company-name'] ][] = $row;
}
foreach ($group as $company_name => $models) {
foreach ($models as $model) {
echo "<a href='$model[id]/'>$model[model-abbreviation]</a>";
}
}
}
if (isset($_GET['id'])) {
$top_thumb = "$image_directory_name" . "top.jpg";
echo "<img src='$top_thumb'>"; echo '</br>';
$images = glob($image_directory_name."*_thumb*");
if (!$images) {
echo 'No images to display.';
}
else {
foreach ($images as $image) {
$full = str_replace('thumb','full',$image);
echo '<img src="'.$image.'">';
}
}
}
So if I use this code in combination with my rewriterule:
RewriteRule ^products/(.*)/$ /products/index.php?id=$1
And I go to a product page, such as localhost/products/30/
No images display, HOWEVER, in the page source I can see that it is TRYING to display the images (though I get no error from my script, just a blank page), just with the wrong path - it looks like this:
<img src='Company Name/Model Name (Model Version)/top.jpg'></br><img src="Company Name/Model Name (Model Version)/A_thumb.jpg">
So the code is working, but the path is wrong. OK.
So I added /products/ to the $image_directory_name variable in this line:
if ($row['model-version'] == NULL) { $image_directory_name = "/products/$company_name/$model_abbreviation/"; } else $image_directory_name = "/products/$company_name/$model_abbreviation (" . $row['model-version'] . ")/";
This is where it breaks.
The top thumb is fixed and displays, but I get my error when trying to glob() the bottom thumbs - 'No images to display'. And the source doesn't even show as trying to load them anymore.
So. I have gotten really close, I've spent countless hours on this. Anyone got any idea what's going on? Something to do with my $image_directory_name path or the glob() code I'm guessing...I am so mentally desperate to solve this.
edit: additional info: When I go to localhost/products/companyname/productname/ in my browser, I get the Error from the if (!$row) line in my code. But I go to localhost/products/companyname/productname/imagename.jpg, the image loads.
update: I even tried moving all of my images from /products/companyname/productname/
to /images/companyname/productname/
The bottom thumbs still don't show up. Argh.