Autoloading with namespaces - php

Question

My structure:
/test/init.php
/test/sub/Info.php
init.php:
<?php
namespace test;
$namespaces = function($path) {
//echo $path; = test\sub\Info
if (preg_match('/\\\\/', $path)) {
$path = str_replace('\\', DIRECTORY_SEPARATOR, $path);
}
//echo $path; = test\sub\Info
if (file_exists("{$path}.php")) {
require_once("{$path}.php");
}
};
spl_autoload_register($namespaces);
$info = new sub\Info();
And Info.php:
<?php
namespace test\sub;
class Info
{
public function __construct()
{
echo 123;
}
}
Why this isn't working?
I use Windows, so why DIRECTORY_SEPARATOR == \?
EDIT:
Sorry, I updated my question. I forgot to paste spl_autoload_register on stackoverflow.

Answer 1

Your autoloader ideally needs to be defined outside of a namespace, at the top level of the directory structure - the way you've got it set up at the moment, it's trying to include the file test/sub/Info.php from within the test directory, rather than from the root (i.e. test/test/sub/Info.php, which doesn't exist)
If you remove the namespace prefix test from both files (so remove it entirely from init.php and just have namespace sub; in sub/Info.php) then it will work correctly. The other option would be to move the autoloader into a file in the root directory, so that the namespaces again match up with the file-system layout.

Answer 2

You are using a relative path, so there are several things that could be wrong... You can see which is the current working directory by doing:
echo getcwd();
You could also try something like this:
$namespaces = function($class) {
$basepath = __DIR__ . DIRECTORY_SEPARATOR . '..' . DIRECTORY_SEPARATOR;
$file = $basepath . str_replace('\\', DIRECTORY_SEPARATOR, $class) . ".php";
if (!file_exists($file) || !is_readable($file)) {
return false;
}
require_once($file);
return class_exists($class, false);
};
Variable $basepath could be also a defined constant, or a variable from a config file...