PHP命名空间namespace的定义方法详解

namespace Test;
class Test{
    public function Ttest(){
     echo "这是Test里面的测试方法"."<br>";
    }
}

namespace Index;
require 'test.php';
$T=new \Test\Test();
$T->Ttest();

namespace Index;
namespace Test;
require 'test.php';
$T=new Test();
$T->Ttest();

namespace Index;
require 'test.php';
use Test\Test;
$T=new Test();
$T->Ttest();

namespace projectOne\one;
class Test{
    public function test(){
     return "this is a test program";
    }
}

namespace projectOne\one;
require '../projectOne/One.php';
$O=new Test();
echo $O->test();

namespace projectOne\one{
    class test{
      public function hello(){
        return "helloworld";
      }
    }
}
namespace projectOne\Two{
    class project{
      public function world2(){
        return "wele to china";
      }
    }
    class project2 extends \projectOne\one\test{
      public function wo(){
        return "this is my test function ,it is name wo";
      }
    }
}
namespace projectOne\Two{
    $p=new project2();
    echo $p->wo()."<br>";
    echo $p->hello();
}