load_class_names_from_dir.php

<?php
if (!function_exists('load_class_names_from_dir')) {
    function load_class_names_from_dir(string $dir): array
    {
        $files = scandir($dir);
        if (!$files) {
            return [];
        }
        return array_filter(array_map(function ($filename) use ($dir) {
            $extension = '.php';
            if (in_array($filename, ['.', '..']) || !str_contains($filename, $extension)) {
                return null;
            }
            return str_replace($extension, '', $filename);
        }, $files));
    }
}