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# Changelog

All notable changes to this project will be documented in this file.

## [0.9.3](https://github.com/brick/math/releases/tag/0.9.3) - 2021-08-15

🚀 **Compatibility with PHP 8.1**

- Support for custom object serialization; this removes a warning on PHP 8.1 due to the `Serializable` interface being deprecated (thanks @TRowbotham)

## [0.9.2](https://github.com/brick/math/releases/tag/0.9.2) - 2021-01-20

🐛 **Bug fix**

- Incorrect results could be returned when using the BCMath calculator, with a default scale set with `bcscale()`, on PHP >= 7.2 (#55).

## [0.9.1](https://github.com/brick/math/releases/tag/0.9.1) - 2020-08-19

✨ New features

- `BigInteger::not()` returns the bitwise `NOT` value

🐛 **Bug fixes**

- `BigInteger::toBytes()` could return an incorrect binary representation for some numbers
- The bitwise operations `and()`, `or()`, `xor()` on `BigInteger` could return an incorrect result when the GMP extension is not available

## [0.9.0](https://github.com/brick/math/releases/tag/0.9.0) - 2020-08-18

👌 **Improvements**

- `BigNumber::of()` now accepts `.123` and `123.` formats, both of which return a `BigDecimal`

💥 **Breaking changes**

- Deprecated method `BigInteger::powerMod()` has been removed - use `modPow()` instead
- Deprecated method `BigInteger::parse()` has been removed - use `fromBase()` instead

## [0.8.17](https://github.com/brick/math/releases/tag/0.8.17) - 2020-08-19

🐛 **Bug fix**

## [0.8.16](https://github.com/brick/math/releases/tag/0.8.16) - 2020-08-18

🚑 **Critical fix**

- This version reintroduces the deprecated `BigInteger::parse()` method, that has been removed by mistake in version `0.8.9` and should have lasted for the whole `0.8` release cycle.

✨ **New features**

- `BigInteger::modInverse()` calculates a modular multiplicative inverse
- `BigInteger::fromBytes()` creates a `BigInteger` from a byte string
- `BigInteger::toBytes()` converts a `BigInteger` to a byte string
- `BigInteger::randomBits()` creates a pseudo-random `BigInteger` of a given bit length
- `BigInteger::randomRange()` creates a pseudo-random `BigInteger` between two bounds

💩 **Deprecations**

- `BigInteger::powerMod()` is now deprecated in favour of `modPow()`

## [0.8.15](https://github.com/brick/math/releases/tag/0.8.15) - 2020-04-15

🐛 **Fixes**

- added missing `ext-json` requirement, due to `BigNumber` implementing `JsonSerializable`

⚡️ **Optimizations**

- additional optimization in `BigInteger::remainder()`

## [0.8.14](https://github.com/brick/math/releases/tag/0.8.14) - 2020-02-18

✨ **New features**

- `BigInteger::getLowestSetBit()` returns the index of the rightmost one bit

## [0.8.13](https://github.com/brick/math/releases/tag/0.8.13) - 2020-02-16

✨ **New features**

- `BigInteger::isEven()` tests whether the number is even
- `BigInteger::isOdd()` tests whether the number is odd
- `BigInteger::testBit()` tests if a bit is set
- `BigInteger::getBitLength()` returns the number of bits in the minimal representation of the number

## [0.8.12](https://github.com/brick/math/releases/tag/0.8.12) - 2020-02-03

🛠️ **Maintenance release**

Classes are now annotated for better static analysis with [psalm](https://psalm.dev/).

This is a maintenance release: no bug fixes, no new features, no breaking changes.

## [0.8.11](https://github.com/brick/math/releases/tag/0.8.11) - 2020-01-23

✨ **New feature**

`BigInteger::powerMod()` performs a power-with-modulo operation. Useful for crypto.

## [0.8.10](https://github.com/brick/math/releases/tag/0.8.10) - 2020-01-21

✨ **New feature**

`BigInteger::mod()` returns the **modulo** of two numbers. The *modulo* differs from the *remainder* when the signs of the operands are different.

## [0.8.9](https://github.com/brick/math/releases/tag/0.8.9) - 2020-01-08

⚡️ **Performance improvements**

A few additional optimizations in `BigInteger` and `BigDecimal` when one of the operands can be returned as is. Thanks to @tomtomsen in #24.

## [0.8.8](https://github.com/brick/math/releases/tag/0.8.8) - 2019-04-25

🐛 **Bug fixes**

- `BigInteger::toBase()` could return an empty string for zero values (BCMath & Native calculators only, GMP calculator unaffected)

✨ **New features**

- `BigInteger::toArbitraryBase()` converts a number to an arbitrary base, using a custom alphabet
- `BigInteger::fromArbitraryBase()` converts a string in an arbitrary base, using a custom alphabet, back to a number

These methods can be used as the foundation to convert strings between different bases/alphabets, using BigInteger as an intermediate representation.

💩 **Deprecations**

- `BigInteger::parse()` is now deprecated in favour of `fromBase()`

`BigInteger::fromBase()` works the same way as `parse()`, with 2 minor differences:

- the `$base` parameter is required, it does not default to `10`
- it throws a `NumberFormatException` instead of an `InvalidArgumentException` when the number is malformed

## [0.8.7](https://github.com/brick/math/releases/tag/0.8.7) - 2019-04-20

**Improvements**

- Safer conversion from `float` when using custom locales
- **Much faster** `NativeCalculator` implementation 🚀

You can expect **at least a 3x performance improvement** for common arithmetic operations when using the library on systems without GMP or BCMath; it gets exponentially faster on multiplications with a high number of digits. This is due to calculations now being performed on whole blocks of digits (the block size depending on the platform, 32-bit or 64-bit) instead of digit-by-digit as before.

## [0.8.6](https://github.com/brick/math/releases/tag/0.8.6) - 2019-04-11

**New method**

`BigNumber::sum()` returns the sum of one or more numbers.

## [0.8.5](https://github.com/brick/math/releases/tag/0.8.5) - 2019-02-12

**Bug fix**: `of()` factory methods could fail when passing a `float` in environments using a `LC_NUMERIC` locale with a decimal separator other than `'.'` (#20).

Thanks @manowark 👍

## [0.8.4](https://github.com/brick/math/releases/tag/0.8.4) - 2018-12-07

**New method**

`BigDecimal::sqrt()` calculates the square root of a decimal number, to a given scale.

## [0.8.3](https://github.com/brick/math/releases/tag/0.8.3) - 2018-12-06

**New method**

`BigInteger::sqrt()` calculates the square root of a number (thanks @peter279k).

**New exception**

`NegativeNumberException` is thrown when calling `sqrt()` on a negative number.

## [0.8.2](https://github.com/brick/math/releases/tag/0.8.2) - 2018-11-08

**Performance update**

- Further improvement of `toInt()` performance
- `NativeCalculator` can now perform some multiplications more efficiently

## [0.8.1](https://github.com/brick/math/releases/tag/0.8.1) - 2018-11-07

Performance optimization of `toInt()` methods.

## [0.8.0](https://github.com/brick/math/releases/tag/0.8.0) - 2018-10-13

**Breaking changes**

The following deprecated methods have been removed. Use the new method name instead:

| Method removed | Replacement method |
| --- | --- |
| `BigDecimal::getIntegral()` | `BigDecimal::getIntegralPart()` |
| `BigDecimal::getFraction()` | `BigDecimal::getFractionalPart()` |

---

**New features**

`BigInteger` has been augmented with 5 new methods for bitwise operations:

| New method | Description |
| --- | --- |
| `and()` | performs a bitwise `AND` operation on two numbers |
| `or()` | performs a bitwise `OR` operation on two numbers |
| `xor()` | performs a bitwise `XOR` operation on two numbers |
| `shiftedLeft()` | returns the number shifted left by a number of bits |
| `shiftedRight()` | returns the number shifted right by a number of bits |

Thanks to @DASPRiD 👍

## [0.7.3](https://github.com/brick/math/releases/tag/0.7.3) - 2018-08-20

**New method:** `BigDecimal::hasNonZeroFractionalPart()`

**Renamed/deprecated methods:**

- `BigDecimal::getIntegral()` has been renamed to `getIntegralPart()` and is now deprecated
- `BigDecimal::getFraction()` has been renamed to `getFractionalPart()` and is now deprecated

## [0.7.2](https://github.com/brick/math/releases/tag/0.7.2) - 2018-07-21

**Performance update**

`BigInteger::parse()` and `toBase()` now use GMP's built-in base conversion features when available.

## [0.7.1](https://github.com/brick/math/releases/tag/0.7.1) - 2018-03-01

This is a maintenance release, no code has been changed.

- When installed with `--no-dev`, the autoloader does not autoload tests anymore
- Tests and other files unnecessary for production are excluded from the dist package

This will help make installations more compact.

## [0.7.0](https://github.com/brick/math/releases/tag/0.7.0) - 2017-10-02

Methods renamed:

- `BigNumber:sign()` has been renamed to `getSign()`
- `BigDecimal::unscaledValue()` has been renamed to `getUnscaledValue()`
- `BigDecimal::scale()` has been renamed to `getScale()`
- `BigDecimal::integral()` has been renamed to `getIntegral()`
- `BigDecimal::fraction()` has been renamed to `getFraction()`
- `BigRational::numerator()` has been renamed to `getNumerator()`
- `BigRational::denominator()` has been renamed to `getDenominator()`

Classes renamed:

- `ArithmeticException` has been renamed to `MathException`

## [0.6.2](https://github.com/brick/math/releases/tag/0.6.2) - 2017-10-02

The base class for all exceptions is now `MathException`.
`ArithmeticException` has been deprecated, and will be removed in 0.7.0.

## [0.6.1](https://github.com/brick/math/releases/tag/0.6.1) - 2017-10-02

A number of methods have been renamed:

- `BigNumber:sign()` is deprecated; use `getSign()` instead
- `BigDecimal::unscaledValue()` is deprecated; use `getUnscaledValue()` instead
- `BigDecimal::scale()` is deprecated; use `getScale()` instead
- `BigDecimal::integral()` is deprecated; use `getIntegral()` instead
- `BigDecimal::fraction()` is deprecated; use `getFraction()` instead
- `BigRational::numerator()` is deprecated; use `getNumerator()` instead
- `BigRational::denominator()` is deprecated; use `getDenominator()` instead

The old methods will be removed in version 0.7.0.

## [0.6.0](https://github.com/brick/math/releases/tag/0.6.0) - 2017-08-25

- Minimum PHP version is now [7.1](https://gophp71.org/); for PHP 5.6 and PHP 7.0 support, use version `0.5`
- Deprecated method `BigDecimal::withScale()` has been removed; use `toScale()` instead
- Method `BigNumber::toInteger()` has been renamed to `toInt()`

## [0.5.4](https://github.com/brick/math/releases/tag/0.5.4) - 2016-10-17

`BigNumber` classes now implement [JsonSerializable](http://php.net/manual/en/class.jsonserializable.php).
The JSON output is always a string.

## [0.5.3](https://github.com/brick/math/releases/tag/0.5.3) - 2016-03-31

This is a bugfix release. Dividing by a negative power of 1 with the same scale as the dividend could trigger an incorrect optimization which resulted in a wrong result. See #6.

## [0.5.2](https://github.com/brick/math/releases/tag/0.5.2) - 2015-08-06

The `$scale` parameter of `BigDecimal::dividedBy()` is now optional again.

## [0.5.1](https://github.com/brick/math/releases/tag/0.5.1) - 2015-07-05

**New method: `BigNumber::toScale()`**

This allows to convert any `BigNumber` to a `BigDecimal` with a given scale, using rounding if necessary.

## [0.5.0](https://github.com/brick/math/releases/tag/0.5.0) - 2015-07-04

**New features**
- Common `BigNumber` interface for all classes, with the following methods:
  - `sign()` and derived methods (`isZero()`, `isPositive()`, ...)
  - `compareTo()` and derived methods (`isEqualTo()`, `isGreaterThan()`, ...) that work across different `BigNumber` types
  - `toBigInteger()`, `toBigDecimal()`, `toBigRational`() conversion methods
  - `toInteger()` and `toFloat()` conversion methods to native types
- Unified `of()` behaviour: every class now accepts any type of number, provided that it can be safely converted to the current type
- New method: `BigDecimal::exactlyDividedBy()`; this method automatically computes the scale of the result, provided that the division yields a finite number of digits
- New methods: `BigRational::quotient()` and `remainder()`
- Fine-grained exceptions: `DivisionByZeroException`, `RoundingNecessaryException`, `NumberFormatException`
- Factory methods `zero()`, `one()` and `ten()` available in all classes
- Rounding mode reintroduced in `BigInteger::dividedBy()`

This release also comes with many performance improvements.

---

**Breaking changes**
- `BigInteger`:
  - `getSign()` is renamed to `sign()`
  - `toString()` is renamed to `toBase()`
  - `BigInteger::dividedBy()` now throws an exception by default if the remainder is not zero; use `quotient()` to get the previous behaviour
- `BigDecimal`:
  - `getSign()` is renamed to `sign()`
  - `getUnscaledValue()` is renamed to `unscaledValue()`
  - `getScale()` is renamed to `scale()`
  - `getIntegral()` is renamed to `integral()`
  - `getFraction()` is renamed to `fraction()`
  - `divideAndRemainder()` is renamed to `quotientAndRemainder()`
  - `dividedBy()` now takes a **mandatory** `$scale` parameter **before** the rounding mode
  - `toBigInteger()` does not accept a `$roundingMode` parameter any more
  - `toBigRational()` does not simplify the fraction any more; explicitly add `->simplified()` to get the previous behaviour
- `BigRational`:
  - `getSign()` is renamed to `sign()`
  - `getNumerator()` is renamed to  `numerator()`
  - `getDenominator()` is renamed to  `denominator()`
  - `of()` is renamed to `nd()`, while `parse()` is renamed to `of()`
- Miscellaneous:
  - `ArithmeticException` is moved to an `Exception\` sub-namespace
  - `of()` factory methods now throw `NumberFormatException` instead of `InvalidArgumentException`

## [0.4.3](https://github.com/brick/math/releases/tag/0.4.3) - 2016-03-31

Backport of two bug fixes from the 0.5 branch:
- `BigInteger::parse()` did not always throw `InvalidArgumentException` as expected
- Dividing by a negative power of 1 with the same scale as the dividend could trigger an incorrect optimization which resulted in a wrong result. See #6.

## [0.4.2](https://github.com/brick/math/releases/tag/0.4.2) - 2015-06-16

New method: `BigDecimal::stripTrailingZeros()`

## [0.4.1](https://github.com/brick/math/releases/tag/0.4.1) - 2015-06-12

Introducing a `BigRational` class, to perform calculations on fractions of any size.

## [0.4.0](https://github.com/brick/math/releases/tag/0.4.0) - 2015-06-12

Rounding modes have been removed from `BigInteger`, and are now a concept specific to `BigDecimal`.

`BigInteger::dividedBy()` now always returns the quotient of the division.

## [0.3.5](https://github.com/brick/math/releases/tag/0.3.5) - 2016-03-31

Backport of two bug fixes from the 0.5 branch:

- `BigInteger::parse()` did not always throw `InvalidArgumentException` as expected
- Dividing by a negative power of 1 with the same scale as the dividend could trigger an incorrect optimization which resulted in a wrong result. See #6.

## [0.3.4](https://github.com/brick/math/releases/tag/0.3.4) - 2015-06-11

New methods:
- `BigInteger::remainder()` returns the remainder of a division only
- `BigInteger::gcd()` returns the greatest common divisor of two numbers

## [0.3.3](https://github.com/brick/math/releases/tag/0.3.3) - 2015-06-07

Fix `toString()` not handling negative numbers.

## [0.3.2](https://github.com/brick/math/releases/tag/0.3.2) - 2015-06-07

`BigInteger` and `BigDecimal` now have a `getSign()` method that returns:
- `-1` if the number is negative
- `0` if the number is zero
- `1` if the number is positive

## [0.3.1](https://github.com/brick/math/releases/tag/0.3.1) - 2015-06-05

Minor performance improvements

## [0.3.0](https://github.com/brick/math/releases/tag/0.3.0) - 2015-06-04

The `$roundingMode` and `$scale` parameters have been swapped in `BigDecimal::dividedBy()`.

## [0.2.2](https://github.com/brick/math/releases/tag/0.2.2) - 2015-06-04

Stronger immutability guarantee for `BigInteger` and `BigDecimal`.

So far, it would have been possible to break immutability of these classes by calling the `unserialize()` internal function. This release fixes that.

## [0.2.1](https://github.com/brick/math/releases/tag/0.2.1) - 2015-06-02

Added `BigDecimal::divideAndRemainder()`

## [0.2.0](https://github.com/brick/math/releases/tag/0.2.0) - 2015-05-22

- `min()` and `max()` do not accept an `array` any more, but a variable number of parameters
- **minimum PHP version is now 5.6**
- continuous integration with PHP 7

## [0.1.1](https://github.com/brick/math/releases/tag/0.1.1) - 2014-09-01

- Added `BigInteger::power()`
- Added HHVM support

## [0.1.0](https://github.com/brick/math/releases/tag/0.1.0) - 2014-08-31

First beta release.

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