Usage of TP5 namespace and use

PHP namespaces (namespaces) were added in PHP 5.3, if you have learned C# and Java, namespaces are nothing new. However, it still has a very important meaning in PHP.
PHP namespaces can solve two types of problems:
name conflicts between user-written code and classes/functions/constants inside PHP or third-party classes/functions/constants.
Create an alias (or short) name for very long identifier names (usually defined to alleviate the first type of problems), improving the readability of the source code.

Reference source: http://www.w3cschool.cn/php/b298tfl0.html

PHP 7 can import classes, functions and constants from the same namespace with a use:

Reference source: http://www.w3cschool.cn/php/php-use-statement.html

<?php
//inc.php documentation for testing
namespace Aaa\Bbb;
class MyClass{
	public $val = 'Who reads and asks you to recite,';
	static $val2 = 'The water falls and the fragrance floats. ';
	function myFun(){
		return 'onestopweb.iteye.com';
	}
}

<?php
header('Content-Type:text/html;charset=utf-8');
//The first, use the full name to access
require 'inc.php';
$myClass = new \Aaa\Bbb\MyClass();
echo $myClass->val;
echo $myClass::$val2;
echo $myClass->myFun();

<?php
//Second, use namespace to access
namespace Aaa\Bbb; //Adjust the current script to the ns domain of Aaa\Bbb, and the namespace declaration must be in the first sentence
header('Content-Type:text/html;charset=utf-8');
require 'inc.php';
$myClass = new MyClass();
echo $myClass->val;
echo $myClass::$val2;
echo $myClass->myFun();

<?php
header('Content-Type:text/html;charset=utf-8');
//The third use use to access
require 'inc.php';
use Aaa\Bbb\MyClass; //This way MyClass is equal to Aaa\Bbb\MyClass
$myClass = new MyClass();
echo $myClass->val;
echo $myClass::$val2;
echo $myClass->myFun();

<?php
header('Content-Type:text/html;charset=utf-8');
//Fourth use use as to access
require 'inc.php';
use Aaa\Bbb as AB; //AB = Aaa\Bbb
$myClass = new AB\MyClass();
echo $myClass->val;
echo $myClass::$val2;
echo $myClass->myFun();

Effect picture:

Usage of TP5 namespace and use

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