wrap($arrays->arrayOf($plugins->loadClass("java.lang.String"), "one", null, "three", "four", null)); // 将非空字符串转换为其长度, 非空字符串长度: [3, 5, 4] $data->mapNotNull(function ($it) use ($objectWrappers) { if ($it != null) return $objectWrappers->wrap($it)->count(); else return null; })->forEach(function ($it) use ($console) { $console->log($it); });