php de-crypto docs

gistfile1.txt

<?php

$_GET['site'] = 'default';
$ignoreAuth = true;
require_once __DIR__ . '/vendor/autoload.php';
require_once("interface/globals.php");

use OpenEMR\Common\Crypto\CryptoGen;

$crypto = new CryptoGen();

$dir   = new RecursiveDirectoryIterator(__DIR__ . "/sites/default/documents/", FilesystemIterator::SKIP_DOTS);
$subdirs  = new RecursiveIteratorIterator($dir);
foreach($subdirs as $filename_path) {
    $parent_dir = $subdirs->getSubPath();
    // echo $filename_path, PHP_EOL;
    // documents are stored under numeric pid in documents folder
    if (is_numeric($parent_dir)) {
        $filename = basename($filename_path);
        // echo $filename, PHP_EOL;
        $new_name = $filename_path . "-decrypted";
        //echo $new_name;
        if (!$fp = fopen($new_name, 'w')) {
            echo "Cannot write file ($new_name)";
            exit;
        }

        $encrypted_file_contents = file_get_contents($filename_path);
        //echo $encrypted_file_contents, PHP_EOL;
        $file_contents = $crypto->decryptStandard($encrypted_file_contents, '', 'database');

        if (fwrite($fp, $file_contents) === FALSE) {
            echo "Cannot write to file ($new_name)";
            exit;
        }
    
        echo "Success, wrote ($file_contents) to file ($new_name)";
    
        fclose($fp);
       
        
    }
}

hello @jfischburg-lifemesh how put this code to? i was created new php but it not work. please tell me how to do with this code? thanks