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 = $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' );