Php pdo error 500

try {
    $dsn = "mysql:dbname=testdb;host={$db_host1}";
    $dbh = new PDO($dsn, $db_username, $db_password);
} catch (PDOException $e) {
    print "Error!: " . $e->getMessage() . "<br/>";
    die();
}

Source: stackoverflow.com

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