vendor/moneyphp/money/src/Currency.php

<?php
 
namespace Money;
 
final class Currency implements \JsonSerializable
{
    private $code;
 
    public function __construct($code)
    {
        if (!is_string($code)) {
            throw new \InvalidArgumentException('Currency code should be string');
        }
 
        if ($code === '') {
            throw new \InvalidArgumentException('Currency code should not be empty string');
        }
 
        $this->code = $code;
    }
 
    public function getCode()
    {
        return $this->code;
    }
 
    public function equals(Currency $other)
    {
        return $this->code === $other->code;
    }
 
    public function isAvailableWithin(Currencies $currencies)
    {
        return $currencies->contains($this);
    }
 
    public function __toString()
    {
        return $this->code;
    }
 
    public function jsonSerialize()
    {
        return $this->code;
    }
}