Decimal2Fraction.php

    /**
     * Convert a decimal to a fraction.
     *
     * @param  number $decimal
     * @return string
     */
    public static function decimal2fraction($decimal)
    {
        $decimalBase = --$decimal;
        $denomenator = 1;
        do {
            $denomenator++;
            $decimal = $decimalBase * $denomenator;
        } while (intval($decimal) != $decimal);

        if ($decimal % $denomenator == 0) {
            $decimal = $decimal / $denomenator;
            $denomenator = $denomenator / $denomenator;
        }
        return $decimal . '/' . $denomenator;
    }