<?php
class MoneyHandler
{
    public static function round(float $money): float
    {
        if (strlen(strval(round($money))) == 1) {
            return $money;		
        }
        
        $str = (string) round($money);
        $lastChar = (int) $str[-1];
        
        if ($lastChar > 0 && $lastChar <= 2) {
            $str = (float) substr($str, 0, -1).'0';
        } else if ($lastChar > 2 && $lastChar <= 5) {
            $str = substr($str, 0, -1).'5';
        } else if ($lastChar > 5 && $lastChar <= 9) {
            $str = (string) round($money + 10);
            $str = substr($str, 0, -1).'0';
        }

        return (float) $str;
    }
}