Test PostgreSQL and MySQL/MariaDB connectivity with PHP

dbtest.php

<?php
$servername = "localhost";
$username = "user";
$password = "password";

echo"Postgre connection test<br>";

try {
  $conn = new PDO("pgsql:host=$servername;dbname=test", $username, $password);
  // set the PDO error mode to exception
  $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  echo "Connected successfully";
} catch(PDOException $e) {
  echo "Connection failed: " . $e->getMessage();
}

echo "<hr>Mariadb connection test<br>";
try {
  $conn = new PDO("mysql:host=$servername;dbname=test", $username, $password);
  // set the PDO error mode to exception
  $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  echo "Connected successfully";
} catch(PDOException $e) {
  echo "Connection failed: " . $e->getMessage();
}