Use Slurpy Basic

slurpy.php

<?php
use Shuble\Slurpy\Operation\OperationArgument\PageRange;
$inputs = array(
    '/path/to/file1.pdf',
    '/path/to/file2.pdf',
    array(
        'filepath'   => '/path/to/file3.pdf',
        'password'   => 'pa$$word',
        'start_page' => 1,
        'end_page'   => 'end',
        'qualifier'  => PageRange::QUALIFIER_ODD,
        'rotation'   => PageRange::ROTATION_EAST,
    )
);
$output = '/path/to/output.pdf';
$slurpy = $factory->cat($inputs, $output);