namespace and use issues (detailed examples are attached)

Two PHP files in a sibling directory

Problem:
How do I invoke the static methods of Class A and Class B in index.php, respectively, in Class C in indexb.php?
How do I fill out the namespace and use?
File One: index.php

namespace {    use    class a{    static public function speak($a)        {            echo $a;        }   }}namespace {use    class a{    static public function speak($a)        {            echo $a.$a;        }   }}

File Two: indexb.php

namespace Php {    class c    {           }}

Reply content:

Two PHP files in a sibling directory

Problem:
How do I invoke the static methods of Class A and Class B in index.php, respectively, in Class C in indexb.php?
How do I fill out the namespace and use?
File One: index.php

namespace {    use    class a{    static public function speak($a)        {            echo $a;        }   }}namespace {use    class a{    static public function speak($a)        {            echo $a.$a;        }   }}

File Two: indexb.php

namespace Php {    class c    {           }}

File index.php:

文件indexb.php

运行indexb.php 结果I am A!I am B!

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index.php

 !--? phpnamespace test{class a{static public funct    Ion speak ($a) {echo $a;    }}}namespace Test2{class B {static public function speak ($a) {echo $a. $a; }}}   

indexb.php

   "!--? Phpnamespace testt{include ' index.php '; use test\a;use test2\b;class c{public $a; Public Function speak () {//Var_dump (new A);//\test\a::speak ($this--->a); A::speak ($this->a);//\test2\b::speak ($this->a); B::speak ($this->a); }} $c = new \testt\c (); $c->a = ' Zhansan '; $c->speak ();}   

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