gistfile1.php

// application library 1 
namespace App\Lib1; 

const MYCONST = 'App\Lib1\MYCONST'; 
 
function MyFunction() { 
  return __FUNCTION__; 
} 

class MyClass { 
  static function WhoAmI() { 
    return __METHOD__; 
  } 
}
...
//usage (WTF?):
\App\Lib2\MyFunction()
...