Laravel Helper function for loading all classes in a given directory

RegisterInDir.php

<?php

if (!function_exists('load')) {
    /**
     * Register all of the commands in the given directory.
     *
     * @param array|string $paths
     * @param string $parentClassName
     * @param callable|null $register
     * @see Illuminate\Foundation\Console\Kernel::load()
     */
    function load($paths, $parentClassName = null, callable $register = null)
    {
        $paths = array_unique(Arr::wrap($paths));
        $paths = array_filter($paths, function ($path) {
            return is_dir($path);
        });

        if (empty($paths)) {
            return;
        }

        $namespace = app()->getNamespace();

        /** @var SplFileInfo $fileInfo */
        foreach ((new Finder)->in($paths)->files() as $fileInfo) {
            $className = $namespace.str_replace(
                ['/', '.php'],
                ['\\', ''],
                Str::after($fileInfo->getPathname(), realpath(app_path()).DIRECTORY_SEPARATOR)
            );

            if ((!$parentClassName || is_subclass_of($className, $parentClassName)) &&
                !app(ReflectionClass::class, ['argument' => $className])->isAbstract()
            ) {
                $class = app($className);
                $register && $register($class);
            }
        }
    }
}