PHP类命名空间与前缀

<?php
// ----- namespace -----
use My\\Namespace;
$object = new Namespace\\Object;

// ----- prefix with PR -----
$object = new PF_Object; //or
$object = new PFObject;

use My\\Namespace\\Foo as Foo;

$object = new Foo;

namespace My\\Debug\\Stuff;
use My\\Production\\Stuff\\Foo as BaseFoo;

class Foo extends BaseFoo {}

// Using native namespace features to shorten class prefixes

<?php
use Sabre_DAV_Auth_Backend_PDO as AuthBackend;
use Zend_Controller_Action_Helper_AutoComplete_Abstract as AutoComplete;

$backend = new AuthBackend();
?>

PHP 5.2.X

PHP 5.3.X