Test PostgreSQL default connection with PHP

index.php

<?php

var_dump(
    pg_connect("
        host=localhost
        port=5432
        dbname=postgres
        user=postgres
        password=root
    ")
);

// Returns the PgSQL\Connection object if the connection is successful.
// Otherwise, returns false
?>

Example used in https://neutrondev.com/setup-postgresql-in-xampp-for-windows/