<?php

use Zend\Math\BigInteger\BigInteger;

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

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

float(1.0E+20)
string(21) "100000000000000000001"

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PHP 7.4, Zend 3.0, Symfony 4.3, Laravel 5.8, PHPUnit 8.0, Doctrine 2.10