<?php foreach($conn->query($sql) as $row){ if(isset($_SESSION['user_id'])){ echo "<tr><td>".$row['Product_ID']."</td><td>".$row['Naam']."</td><td>".$row['Prijs']."</td><td>".$row['Beschrijving']."</td><td><a class='but_add' href='addItem.php?add=$row[Product_ID]'><i class='far fa-plus-square fa-s'></i> Add</a></td></tr>"; }else{ echo "<tr><td>".$row['Product_ID']."</td><td>".$row['Naam']."</td><td>".$row['Prijs']."</td><td>".$row['Beschrijving']."</td><td><a class='but_add' href='login.php'><i class='far fa-plus-square fa-s'></i> Add</a></td></tr>"; } } ?>
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Value for `_results` contains invalid data `array`