What are common challenges when trying to access a PostgreSQL database from PHP on a QNAP NAS?

One common challenge when trying to access a PostgreSQL database from PHP on a QNAP NAS is ensuring that the necessary PHP extensions are installed and enabled. To solve this, you can check the PHP configuration on your QNAP NAS to make sure that the `pdo_pgsql` and `pgsql` extensions are enabled.

<?php
// Check if the pdo_pgsql and pgsql extensions are enabled
if (!extension_loaded('pdo_pgsql') || !extension_loaded('pgsql')) {
    die('PostgreSQL extensions are not enabled. Please enable them in your PHP configuration.');
}