Online PHP editor | output for 4MecV

<?php class BigDecimal { private $value; private $scale; function __construct(string $value){ if(preg_match('@^[0-9]*(?:.[0-9]*)?$@', $value) !== 1){ throw new Error("Invalid BigDecimal value $value"); } $this->value = $value; $this->scale = $this->getScaleOf($value); echo "scale of $value is " . $this->scale . "\n"; } private function getScale(BigDecimal $other){ return max($this->scale, $other->scale); } private function getScaleOf(string $value){ $pos = strrpos($value, '.'); if($pos === false){ return 0; } return strlen($value) - $pos - 1; } function valueEquals($other){ } function add(BigDecimal $other){ return new self(bcadd($this, $other, $this->getScale($other))); } function div(BigDecimal $other){ return new self(bcdiv($this, $other, $this->getScale($other))); } function mod(BigDecimal $other){ // not sure if mod or rem return new self(bcmod($this, $other, $this->getScale($other))); } function mul(BigDecimal $other){ return new self(bcmul($this, $other, $this->getScale($other))); } function pow(BigDecimal $other){ return new self(bcpow($this, $other, $this->getScale($other))); } function sub(BigDecimal $other){ return new self(bcsub($this, $other, $this->getScale($other))); } function __toString(){ return $this->value; } } function d(string $value){ return new BigDecimal($value); } echo d('10.123')->sub(d('5.02'));