PHP library that generates unique strings from integers

<?php
/*
 * This file is part of Hashids.
 * (c) Ivan Akimov <ivan@barreleye.com>
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Hashids;
use RuntimeException;
/**
 * This is the math class.
 * @author Vincent Klaiber <hello@vinkla.com>
 * @author Jakub Kramarz <lenwe@lenwe.net>
 */
class Math
{
    /**
     * Add two arbitrary-length integers.
     * @param string $a
     * @param string $b
     * @throws \RuntimeException
     * @return string
     */
    public static function add($a, $b)
    {
        if (function_exists('gmp_add')) {
            return gmp_add($a, $b);
        }
        if (function_exists('bcadd')) {
            return bcadd($a, $b, 0);
        }
        throw new RuntimeException('Missing BC Math or GMP extension.');
    }

A string or string (String) is a string of characters composed of numbers, letters, and underscores. Generally recorded as s=“a1a2···an” (n>=0). It is a data type that represents text in programming languages. In programming, a string is a continuous sequence of symbols or values, such as a symbol string (a string of characters) or a binary digit string (a string of binary digits).

Usually the entire string is used as the operation object, such as: finding a substring in the string, obtaining a substring, inserting a substring at a certain position in the string, deleting a substring, etc. The necessary and sufficient conditions for two strings to be equal are: the lengths are equal, and the characters at each corresponding position are equal. Assume that p and q are two strings. The operation of finding the position where q first appears in p is called pattern matching. The two most basic storage methods of strings are sequential storage and linked storage.

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