1. Go to this page and download the library: Download elcweb/keyvaluestore-bundle 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/ */
php
$ks = $this->get('elcweb.keyvaluestore');
$values = $ks->getAll('KeyName');
// If you have a keys called foo.bar and foo.foo this will return an array with key bar and foo