1. Go to this page and download the library: Download cast/uint64 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/ */
cast / uint64 example snippets
composer
use Cast\Crypto\unit64\Uint64 as uint64;
use function Cast\Crypto\unit64\add;
$a = new uint64("4f3f9abb2e7c8889");
$b = new uint64("68825a36ac081669");
$c = add($a, $b);
$c->hilo(); // 3082941681, 3666124530
$c->getHex(); // b7c1f4f1da849ef2