Hierarchical management of php namespace

* Hierarchical management of namespaces

* 1. Unqualified name: No space prefix is ​​used before the name of the space member, similar to accessing the current directory

//Declare namespace one

namespace one ;
class Demo{public $name='Peter Zhu';}
const SITE='PHP中文网';
function add($a,$b){return $a+$b;}

//Qualified name: similar to relative path access

tow\Demo 会自动加上当前空间前缀:one

//Finally resolved to: one\two\Demo

echo (new two\Demo)->name,&#39;<br>&#39;;

//Declare namespace two,two It is a subspace of one

namespace one\two;
class Demo{public $name='朱老师';}
const  SITE = 'www.php.cn';
function add($a,$b){return $a+$b;}

//Unqualified name: similar to access in the current directory

//No need to add a space prefix for access in the current space

echo (new Demo)->name,&#39;<br>&#39;;

// Fully qualified name: Starting from the global space, similar to starting from the root directory

//Starting from the current one\two\, to access members of another space, start from the root

echo (new \one\Demo)->name;

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