BCMath functions helper for laravel

MathHelper.php

<?php
namespace App\Helpers;

/**
 * Class MathHelper
 * @package App\Helpers
 *
 * Implements negative, ceiling, floor and round functions with BCMath precision
 * Credit to Matt Raines for function logic: https://stackoverflow.com/users/5024519/matt-raines
 */
class MathHelper {
    /**
     * Is negative?
     * @param string|int $n
     * @return bool
     */
     public static function bcnegative($n): bool
     {
        return strpos($n, '-') === 0; // Is the number less than 0?
    }

    /**
     * @param string|int $n
     * @return string
     */
    public static function bcceil($n): string
    {
        return self::bcnegative($n) ? (($v = self::bcfloor(substr($n, 1))) ? "-$v" : $v)
            : bcadd(strtok($n, '.'), (string)(strtok('.') != 0));
    }

    /**
     * @param string|int $n
     * @return string
     */
    public static function bcfloor($n): string
    {
        return self::bcnegative($n) ? '-' . self::bcceil(substr($n, 1)) : strtok($n, '.');
    }

    /**
     * @param string|int $n
     * @param int $precision
     * @return string|null
     */
    public static function bcround($n, int $precision = 0): ?string
    {
        $e = bcpow('10', (string)($precision + 1));
        return bcdiv(bcadd(bcmul($n, $e, 0), (string)(self::bcnegative($n) ? -5 : 5)), $e, $precision);
    }


}