Three ways to use php namespace

The namespace in PHP 5.3 is actually a good thing, which can simplify programming. Here are three types of methods to access classes in the namespace in the code
1 Reference namespace and classes
Assume that the namespace program is namespaced-class.php

namespace Christmas\DaysOf;  
class PartridgeInAPearTree{
}

  include 'namespaced-class.php';
$bird1 = new Christmas\DaysOf\PartridgeInAPearTree();
var_dump($bird1);

2 Partial reference

  include 'namespaced-class.php';
use Christmas\DaysOf;
$bird2 = new DaysOf\PartridgeInAPearTree();
var_dump($bird2);

3 The simplest

 include 'namespaced-class.php';
use Christmas\DaysOf\PartridgeInAPearTree as Bird;            
$bird3 = new Bird();
var_dump($bird3);

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