class. * * @param string $class * the name of the class to load */ function mmdb_autoload($class): void { /* * A project-specific mapping between the namespaces and where * they're located. By convention, we include the trailing * slashes. The one-element array here simply makes things easy * to extend in the future if (for example) the test classes * begin to use one another. */ $namespace_map = ['MaxMind\Db\\' => __DIR__ . '/src/MaxMind/Db/']; foreach ($namespace_map as $prefix => $dir) { // First swap out the namespace prefix with a directory... $path = str_replace($prefix, $dir, $class); // replace the namespace separator with a directory separator... $path = str_replace('\\', '/', $path); // and finally, add the PHP file extension to the result. $path .= '.php'; // $path should now contain the path to a PHP file defining $class if (file_exists($path)) { include $path; } } } spl_autoload_register('mmdb_autoload');