connect_error) { die("Connection failed: " . $conn->connect_error); }
getMessage()); }This code example shows how to connect to a PostgreSQL database using PHP's PDO extension. It requires the `pdo_pgsql` extension to be installed in PHP. Package Library: PHP DB host does not refer to a specific package library, as it is a general abstraction layer for connecting to databases. However, the code examples shown above require the installation of specific extensions (`mysqli` and/or `pdo_pgsql`) in PHP, which can be installed using package managers like Composer or PECL.