Autoload function on PHP. Code example

When working with small projects, we can use the autload function:

use classes\BookProduct;
use classes\NotebookProduct;

require_once 'classes/Product.php';
require_once 'classes/Gadget.php';
require_once 'classes/NotebookProduct.php';
require_once 'classes/BookProduct.php';

function autoloder1($class)
{
    $class = str_replace("\\", '/', $class);
    $file = __DIR__ . "/{$class}.php";
    if(file_exists($file)){
        require_once $file;
    }
}

spl_autoload_register('autoloder1');