<?php spl_autoload_register(function ($class) { $prefix = 'Updraftplus\Wp_Optimize\\'; // Only handle classes with namespace starting with prefix. if (strpos($class, $prefix) !== 0) { return; } // Remove the namespace prefix $relative_class = substr($class, strlen($prefix)); $relative_path = str_replace('\\', DIRECTORY_SEPARATOR, $relative_class) . '.php'; $file = __DIR__ . DIRECTORY_SEPARATOR . $relative_path; // Require the file if it exists. if (file_exists($file)) { require_once $file; } });