addPDF('samplepdfs/one.pdf', '1, 3, 4') ->addPDF('samplepdfs/two.pdf', '1-2') ->addPDF('samplepdfs/three.pdf', 'all') ->merge('file', 'samplepdfs/TEST2.pdf'); //REPLACE 'file' WITH 'browser', 'download', 'string', or 'file' for output options //You do not need to give a file path for browser, string, or download - just the name.