PHP Auto-loader

autoload.php

<?php
spl_autoload_register(function (string $class_name): void {
    $namespace = 'Gordarg';
    if (strpos($class_name, $namespace) === 0) {
        $class_file = ROOT_PATH . 'src';
        $class_file .=
            str_replace(
                [$namespace, '\\'],
                ['', DIRECTORY_SEPARATOR],
                $class_name
            )
            . '.php';
        if (file_exists($class_file)) {
            require_once $class_file;
            return;
        }
    }
});