DeveloperGuide/step-0-sample-apps/sample-php-app-rest/public/database_info.php

<?php

$servername = getenv("DB_SERVERNAME");
$username = getenv("DB_USERNAME");
$password = getenv("DB_PASSWORD");
$dbname = getenv("DB_DATABASE");

echo $servername;
echo $username;
echo $password;
echo $dbname;


?>