loop to check and remove image if not exist - php

Question

I'm trying to make a loop which checks if an image with filename from database exists, if not to unlink all images because I have many duplicates in folder but folder is 50gb. I can't check each one.
So here's what I've tried
$id = $_GET['id'];
$sql = "SELECT thumbnail FROM files WHERE id='$id'";
$query = $mysqli->query($sql);
$row = $query->fetch_assoc();
$thumb = $row['thumbnail'];
$records = "../upload/images/";
foreach ($records as $record) {
if (file_exists('../upload/images/'.$thumb)) {}
else {
#unlink('../upload/images/'.$thumb);
}
}
Update
$sql = "SELECT thumbnail FROM filesWHERE id='$id'";
$query = $mysqli->query($sql);
$row = $query->fetchAll();
foreach($sql as $search_result) {
if(file_exists($search_result['thumbnail'])) {
$img_source = ('../upload/images/'.$search_result['thumbnail']);
} else {
#unlink('../upload/images/'.$search_result);
}
}

Answer 1

That's the logic I've understood. Checking if there are files in the folder that aren't present in database, and if so, delete it.
$directory = "../upload/images/";
$images = glob($directory . "*.jpg");
foreach($images as $image)
{
$sql = "SELECT thumbnail FROM files WHERE thumbnail =?";
$stmt = $mysqli->prepare($sql);
if($stmt) {
$stmt->bind_param('s', $image);
$stmt->bind_result($result);
$stmt->execute();
$stmt->fetch();
if(!$result) {
if(unlink($image)) {
echo "Image deleted $image <br>\n";
}
}
} else {
echo "Unable to prepare SQL";
}
}