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<?php /** * Immutable class for handling numbers with precision. * * Never change the $number or the $precision after the creation of the object. */ class DecimalNumber { private $precision; private $number; public function __construct() { return $this; } /** * Get an instance given a string and a precision * @param string $string The decimal number in string form * @param int $precision The precision of the number * @return DecimalNumber Return new instance */ public static function get($string, $precision = 4) { $number = static::_get($string, $precision); $number->number = bcadd($string, '0', $precision); return $number; } private static function _get($string, $precision) { $me = get_called_class(); $number = new $me; $number->precision = $precision; $number->number = $string; return $number; } /** * Add a formal entry point for decimal numbers * @param DecimalNumber $number Decimal number to base off of * @param integer $precision new precision * @return DecimalNumber DecimalNumber with new precision */ public static function decimalNumber(DecimalNumber $number, $precision = 4) { if ($number->precision === $precision) return clone $number; return static::get($number, $precision); } /** * Perform an addition operation * @param DecimalNumber $number Addend * @return DecimalNumber Sum */ public function sum(DecimalNumber $number) { return DecimalNumber::_get(bcadd($this->number, $number, $this->precision), $this->precision); } /** * Perform a subtraction operation * @param DecimalNumber $number Addend * @return DecimalNumber Sum */ public function difference(DecimalNumber $number) { return DecimalNumber::_get(bcsub($this->number, $number, $this->precision), $this->precision); } /** * Perform a multiplication operation * @param DecimalNumber $number Multiplier * @return DecimalNumber Product */ public function product(DecimalNumber $number) { return DecimalNumber::_get(bcmul($this->number, $number, $this->precision), $this->precision); } /** * Perform a division operation * @param DecimalNumber $number Divisor * @return DecimalNumber Quotient */ public function quotient(DecimalNumber $number) { return DecimalNumber::_get(bcdiv($this->number, $number, $this->precision), $this->precision); } public function floored() { return DecimalNumber::_get(bcadd(bcadd($this->number, '0'), '0', $this->precision), $this->precision); } /** * Automagically convert to a string * @return string returns a string containing the value of this DecimalNumber */ public function __toString() { return $this->number; } } $a = DecimalNumber::get('.7'); $b = DecimalNumber::get('.1'); $c = $a->sum($b); $d = $c->product(DecimalNumber::get('10')); echo $d;