[SMARTY] Is this a good way to setup Smarty?

<?PHP
/**
 * set_env.php 
 * @author Tom Anderson <[email protected]>
 * @version 2.5
 *
 * This script sets up smarty, pear, and all other
 * global settings for a php application.
 */

// Client specific variables
error_reporting(E_ALL - E_NOTICE);

// db connect info
$dsn = 'mysql://root:root@localhost/database';

// Setup include path
$web_root = 'http://www.mysite.org/subdirifneeded/';
$app_root = '/home/mysite/projects/myapp/';
# note:  sometimes pear is installed at /usr/local/lib/php/ but I 
# recommend getting a copy that is local to your application so 
# you can more easily controll when pear code is updated.
$pear = $app_root . '/pear/'; 
//---------------------------------------
//--- end user edit

// Path to .ihtml (template) files
define('TEMPLATE_DIR', "$app_root/ihtml/");
$delim = (PHP_OS == "WIN32" || PHP_OS == "WINNT") ? ';': ':';
ini_set('include_path', ".{$delim}$pear{$delim}$app_root/include{$delim}$app_root");

// Set magic quotes based on database type.  If using either of these and using odbc, 
// you will need to set this by hand.  
// You should be able to safely comment this out if your system is setup right. 
ini_set('magic_quotes_sybase', ($dbType == 'mssql' || $dbType == 'sybase') ? '1': '0');

// Include pear database handler, auth object (remove if not used), and smarty
require_once 'DB.php';
require_once 'smarty/Smarty.class.php';

// Change error handling as necessary
// PEAR_ERROR_RETURN, PEAR_ERROR_PRINT, PEAR_ERROR_TRIGGER, PEAR_ERROR_DIE or PEAR_ERROR_CALLBACK
// PEAR::setErrorHandling(PEAR_ERROR_PRINT);
PEAR::setErrorHandling(PEAR_ERROR_CALLBACK, 'errhndl');
function errhndl ($err) {
    echo '<pre>' . $err->message;
    print_r($err);
    die();
} 

// Connect to the database and set fetch mode as necessary.  Include db extension as needed
// The next two lines can be safely commented if your system is setup right.
$extension = "php_$dbType" . (strpos(PHP_OS, "WIN") >= 0 ? ".dll" : ".so");
if (!function_exists($dbType . '_connect')) dl($extension);

// Connect to the database
$db = DB::connect($dsn);
$db->setFetchMode(DB_FETCHMODE_ASSOC);  // Other modes possible; I find assoc best.
$db->setOption('optimize', 'portability');  // This is really useful for me personally but may not be for everyone.

// Setup template object - NOTE:  in this example, 'smarty' is a symlink to 
// the smarty directory.  This allows you to upgrade Smarty without changing code.
$t = new smarty;
$t->template_dir = TEMPLATE_DIR;
// For other compile and cache directory options, see the comment by Pablo Veliz at the bottom of this article.
$t->compile_dir = $app_root . '/compile';
$t->cache_dir = $app_root . '/cache';
// Because you should never touch smarty files, store your custom smarty functions, modifiers, etc. in /include
$t->plugins_dir = array($app_root . '/include', $app_root . '/smarty/plugins');

// Change comment on these when you're done developing to improve performance
$t->force_compile = true;
//$t->caching = true;

## GLOBALS:  $db, $t
session_start();

/* BEGIN USER AUTH - totally optional */
// Add user authentication here if you want
// This example uses pear::Auth
require_once 'Auth/Auth.php';
$a = new Auth(
	'DB',
	array(
		'table' => 'users',
		'usernamecol' => 'login',
		'passwordcol' => 'password',
		'dsn' => $dsn
		),
	'login_function_name',
	true
);

// Use case insensitive login
if (isset($_POST['username'])) $_POST['username'] = strtoupper($_POST['username']);

// Check for logout
if ($_REQUEST['logout'] && $a->getAuth()) {
	$a->start();
	$a->logout();
	session_destroy();
	header("Location: $web_root");
	exit();
}

// Init the session for this user and authorize.
$a->start();
// You could use a global '$require_login = 1;' before 'require_once 'set_env.php';' 
// then check for it here so not all pages require login
if (!$a->getAuth()) {
	die();
}
/* END USER AUTH */

// Assign any global smarty values here.
$t->assign('web_root', $web_root);
?>