simpler https://github.com/igorw/ilias/compare/autoload draft

gistfile1.txt

edo@localhost ~/auto-all-the-loads $ tree && find . -type f -print -exec cat {} \;
.
|-- autoload.php
|-- index.php
`-- src
    |-- A.php
    `-- bar
        |-- baz
        |   `-- B.php
        `-- B.php

3 directories, 5 files
./src/A.php
<?php

namespace edo\foo;

class A {}
./src/bar/baz/B.php
<?php

namespace edo\foo\bar\baz;

class B {}
./src/bar/B.php
<?php

namespace edo\foo\bar;

class B {}
./index.php
<?php

namespace edo\foo;

require_once __DIR__ . '/autoload.php';

$x = new A();
$y = new \edo\foo\bar\B();
$z = new \edo\foo\bar\baz\B();

echo "Jojo";
./autoload.php
<?php

spl_autoload_register(function($className) {
    $prefix = 'edo\\foo\\';
    if (strncmp($prefix, $className, strlen($prefix)) === 0) {
        require __DIR__ . '/src/' . str_replace('\\', '/', substr($className, strlen($prefix))) . '.php';
    }   
});

php index.php
string(38) "/home/edo/auto-all-the-loads/src/A.php"
string(42) "/home/edo/auto-all-the-loads/src/bar/B.php"
string(46) "/home/edo/auto-all-the-loads/src/bar/baz/B.php"