<?php

use Laminas\Math\BigInteger\BigInteger;

$i = 100000000000000000000 + 1;
dump($i);

$bcmath = BigInteger::factory('Gmp');
$i = $bcmath->add('100000000000000000000', '1');
dump($i);


^ 1.0E+20

^ "100000000000000000001"

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PHP 8.0, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8