wp-config.php db setting for heroku

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// ** MySQL settings - You can get this info from your web host ** //
$db = parse_url($_ENV["DATABASE_URL"]);

/** The name of the database for WordPress */
define('DB_NAME', trim($db["path"],'/'));

/** MySQL database username */
define('DB_USER', $db["user"]);

/** MySQL database password */
define('DB_PASSWORD', $db["pass"]);

/** MySQL hostname */
define('DB_HOST', $db["host"]);

/** Database Charset to use in creating database tables. */
define('DB_CHARSET', 'utf8');

/** The Database Collate type. Don't change this if in doubt. */
define('DB_COLLATE', '');