bc math decimals wrapper

Bcdec.php

<?php

declare(strict_types=1);

/**
 * wrapper around the bcdec extension
 * 
 * @see https://www.php.net/manual/en/book.bc.php
 */
class Bcdec
{
	/** @var float */
	protected $fNumber;

	/** @var int */
	protected $iDecimals;

	/**
	 * constuct
	 *
	 * @param float $fNumber
	 * @param int $iDecimals
	 */
	public function __construct($fNumber, int $iDecimals = 9)
	{
		$this->fNumber = (string) $fNumber;
		$this->iDecimals = $iDecimals;
	}

	/**
	 * Add two arbitrary precision numbers
	 *
	 * @param float $fNum
	 * @return self
	 */
	public function add($fNum): self
	{
	    $fNum = (string) $fNum;
	    
		$this->fNumber = bcadd($this->fNumber, $fNum, $this->iDecimals);

		return $this;
	}

	/**
	 * Subtract one arbitrary precision number from another
	 *
	 * @param float $fNum
	 * @return self
	 */
	public function subtract($fNum): self
	{
	    $fNum = (string) $fNum;
	    
		$this->fNumber = bcsub($this->fNumber, $fNum, $this->iDecimals);

		return $this;
	}

	/**
	 * Divide two arbitrary precision numbers
	 *
	 * @param float $fNum
	 * @return self
	 */
	public function divide($fNum)
	{
	    $fNum = (string) $fNum;
	    
		if ($fNum != 0) {
			$this->fNumber = bcdiv($this->fNumber, $fNum, $this->iDecimals);
		}

		return $this;
	}

	/**
	 * Multiply two arbitrary precision numbers
	 *
	 * @param float $fNum
	 * @return self
	 */
	public function multiply($fNum): self
	{
	    $fNum = (string) $fNum;
	    
		$this->fNumber = bcmul($this->fNumber, $fNum, $this->iDecimals);

		return $this;
	}

	/**
	 * get the result
	 *
	 * @return float
	 */
	public function get(): string
	{
		return $this->fNumber;
	}

	/**
	 * to string
	 *
	 * @return string
	 */
	public function __toString(): string
	{
		return (string) $this->get();
	}
}

example.php

<?php

declare(strict_types=1);

$dec = (new Bcdec(1.2, 2))
    ->add(1.4)
    ->multiply(2)
    ->subtract(1)
    ->add(64.8);

echo (string) $dec; // 69.00, nice