1. Go to this page and download the library: Download fungku/postmark library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
use Pagemark\Pagemark;
use Pagemark\Parser;
use Illuminate\Filesystem\Filesystem;
use Parsedown;
$pagemark = new Pagemark(new Filesystem, new Parser(new Parsedown));
$basePath = '/my/path/to/wiki';
$post = 'Category/Subcategory/My-Post';
$content = $pagemark->getContent($basePath, $post);