Legacy autoload example

autoload.php

<?php
/*
 * Legacy autoload example
 */
spl_autoload_register(function ($requestedClass) {
    $baseClass='ElseifAB\\Regnradar';

    if (0!=strpos($requestedClass, $baseClass.'\\', 0)) {
        return false;
    }

    static $loaded = [];
    if (isset($loaded[$requestedClass])) {
        return $loaded[$requestedClass];
    }

    $fileClass = str_replace($baseClass, '', $requestedClass);
    $fileClass = str_replace('_', '-', $fileClass);
    $fileClass = str_replace('\\', DIRECTORY_SEPARATOR, $fileClass);

    $fileClass.='.php';
    $fileClass=__DIR__.$fileClass;

    if (!file_exists($fileClass)) {
        return false;
    }

    return $loaded[$requestedClass] = (bool)require $fileClass;
});