Using PHP namespaces on a subnamespace -

good day. i'm working on example understand namespces are, , limitations. have structure (windows):

d:\server\sistemas\tests\phpns\exec.php

d:\server\sistemas\tests\phpns\extra\call.php

d:\server\sistemas\tests\phpns\extra\exec.php --> (copy of other one)

d:\server\sistemas\tests\phpns\lib\base.php

code each one:

exec.php

<?php  spl_autoload_register();  $a = new extra\call(); ?> 

call.php

<?php namespace extra{     spl_autoload_register();      class call{         public function __construct(){             $inst = new \libs\base();             var_dump($inst);         }     } } ?> 

base.php

<?php namespace libs{     class base{         public $dac;         public $doc;         public function __construct(){          }     } } ?> 

if work under scenario, totally ok. problem when execute extra\exec.php

extra\exec.php

<?php  namespace extra{     spl_autoload_register();      $a = new call(); } ?> 

it's supposed filesystem context of file that's why i'm using namespace not working. got error.

fatal error: spl_autoload(): class extra\call not loaded in d:\server\sistemas\tests\phpns\extra\exec.php on line 5

then remember php classes called trailing backslash (\iterator) tried too:

extra\exec.php

<?php     spl_autoload_register();      $a = new \extra\call();  ?> 

but got same result... doing wrong, , should if want use file in or in n-depth directory?

first off, it's not recommended use namespace declarations blocks. it's preferred declare namespace , go classes , place 1 class per file. how declare \extra\call

namespace extra;  class call{     public function __construct(){         $inst = new \libs\base();         var_dump($inst);     } } 

you typically use spl_autoload_register(); name of callable function haven't provided functions act autoloader. autoload function should have sole argument name of class you're trying load. should find class file , include or require file. here's example from php docs

spl_autoload_register(function ($class) {     include 'classes/' . $class . '.class.php'; });