Getting Error in PHP Autoload

I am using PSR-0 for auto loading, I know that I need to use PSR-4 which I will do it latter part. Even if PSR-4, answers are welcome.

I am having the following directory structure for which the auto loading works fine.

+ www/entity
|__ /EntityGenerator
|       |__ /Database
|       |       |__ DatabaseConnection
|       |       |__ DatabaseConnectionInterface
|       |       |__ DatabaseRepositoryInterface
|       |       
|       |__ /Exception
|
|__ autoload.php
|__ index.php

For the following directory structure its giving error as follows

Warning: require(EntityGenerator\Database\DatabaseConnection.php): failed to open stream: No such file or directory in C:\wamp\www\entity\EntityGenerator\autoload.php on line 15

+ www/entity
| __ /EntityGenerator
        |__ /Database
        |       |__ DatabaseConnection
        |       |__ DatabaseConnectionInterface
        |       |__ DatabaseRepositoryInterface
        |       
        |__ /Exception
        |__ autoload.php
        |__ index.php

Can anyone explain why I am getting the error with second directory structure.

If anyone needs the whole code for testing, please find the below link

https://github.com/channaveer/EntityGenerator

Your problem is you're using a relative path, which is not always set as the current script's directory. You need to use absolute paths to be sure you're loading what you need to load.

function autoload($className)
{
    $namespaceRoot = "EntityGenerator"; 
    $className = ltrim($className, '\\');
    if (strpos($className,$namespaceRoot) !== 0) { return; } //Not handling other namespaces
    $className = substr($className, strlen($namespaceRoot));
    $fileName  = '';
    $namespace = '';
    if ($lastNsPos = strrpos($className, '\\')) {
        $namespace = substr($className, 0, $lastNsPos);
        $className = substr($className, $lastNsPos + 1);
        $fileName  = str_replace('\\', DIRECTORY_SEPARATOR, $namespace) . DIRECTORY_SEPARATOR;
    }
    $fileName .= str_replace('_', DIRECTORY_SEPARATOR, $className) . '.php';
    require __DIR__.DIRECTORY_SEPARATOR.$fileName; //absolute path now
}
spl_autoload_register('autoload');

__DIR__ is guaranteed to return the directory which the current script is in.