php uses alias to import namespace

* Use alias to import namespace

* Use of use keyword

//1. Declare a namespace one

namespace one ;
use one\two\three\Demo;

//If the current class also has one What should I do with the Demo class with the same name? Give the imported class an alias

use one\two\three\Demo as Demo1;
class Demo1{public $name='Peter Zhu';}
class Demo{public $name='Peter Zhu';}
const SITE='PHP中文网';
function add($a,$b){return $a+$b;}

//Access in the current space: Class in one\two\three space

//Must add a long length The space prefix

echo (new two\three\Demo)->name;
echo (new Demo)->name;
echo (new Demo1)->name;

//2. Declare the namespace: one\two\three

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

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