<?php

class NUMBERS
{
    /**
     * Determine if numer is a float even when placed in a string. Bases type on a foreknown decimal length
     * @param $num
     * @param int $decimals
     * @return bool
     */
    public static function isFloat($num, $decimals = 2)
    {
        if(stristr($num, ',') && stristr($num, '.'))
        {
            return true;
        }
        elseif(stristr($num, ','))
        {
            $separator = ',';
        }
        elseif(stristr($num, '.'))
        {
            $separator = '.';
        }

        if(isset($separator))
        {
            if(substr_count($num, $separator) > 1)//if it's a decimal separator, there can be only one ;)
                return false;

            $end = end(explode($separator, $num));

            if(strlen($end) == $decimals)
                return true;
        }


        return false;
    }

    /**
     * Normalize number with unknown original locale formatting to default formatting. Assumes foreknown decimal length
     * @param $num
     * @param int $decimals
     * @return float|int
     */
    public static function normalize($num, $decimals = 2)
    {
        $num = preg_replace('/\s+/', '', $num);

        if(self::isFloat($num, $decimals))
        {
            $separator = self::getDecimalSeparator($num, $decimals);
            if($separator == '.')
            {
                return floatval(str_replace(',', '', $num));
            }
            else
            {
                return floatval(str_replace(',', '.', str_replace('.', '', $num)));
            }
        }
        else
        {
            return intval(str_replace([',', '.'], '', $num));
        }
    }

    /**
     * Input assumes a float in string. Returns the last separator in the string, based on the decimal length
     * @param float|string $num
     * @param int $decimals
     * @return string
     */
    public static function getDecimalSeparator($num, $decimals = 2)
    {
        return substr($num, strlen($num) - $decimals - 1, 1);
    }

    /**
     * Greedy check for numeric values in a string. If the string could be interpreted as numeric it returns true
     * @param $num
     * @return int
     */
    public static function isNumeric($num)
    {
        return preg_match('/(\d+)(((.|,)\d+)+)?/', $num);
    }
}