Magento – Magento 2 – Rounding Float Values to Currency Precision

Ok first of all I saw the event currency_display_options_forming and I thought that this would be so easy, but sadly that was not the case :( You can use this event to change the display of the currency across the whole site but the follow code stops the precision from working in all cases.

Under Mage_Directory_Model_Currency there is a function formatPrecision. Here it checks for the options and if it does not find one for precision it will hard code it to 2!

So the first thing I did as Marius said is to rewrite the Mage_Directory_Model_Currency::format I chose to set it up with xml (great minds think alike)

public function format($price, $options = array(), $includeContainer = true, $addBrackets = false)
{
    return $this->formatPrecision(
        $price,
        Mage::getStoreConfig(self::XML_PATH_CURRENCY_ALLOW), // Mage uses '2' here
        $options,
        $includeContainer,
        $addBrackets
    );
}

But that only changes the display. Most of the price displays all call Mage_Core_Model_Store::roundPrice and this again has a hard coded 2, I am starting to think this was a bad idea.

public function roundPrice($price)
{
    return round($price, 2);
}

So the obvious thing now is to rewrite the roundPrice function and again use the same xml config value.

public function roundPrice($fPrice)
{
    return round($fPrice, Mage::getStoreConfig(Sitewards_Currency_Model_Format::XML_PATH_CURRENCY_ALLOW));
}

Now that covers most of the front-end if you also want to change this in the admin section that would involve changing templates and rewriting at least Mage_Adminhtml_Block_Catalog_Product_Helper_Form_Price

public function getEscapedValue($iIndex=null)
{
    $fValue = $this->getValue();

    if (!is_numeric($fValue)) {
        return null;
    }

    return number_format($fValue, Mage::getStoreConfig(Sitewards_Currency_Model_Format::XML_PATH_CURRENCY_ALLOW), null, '');
}

One not on the template front, the one I know about now is catalog/product/edit/price/tier.phtml as again that has <?php echo sprintf('%.2f', $_item['price']) ?>

On one final note the admin grid actually does work with the first event currency_display_options_forming.

I will update this answer the more I find out, but it is still a work in progress.

You have to add empty space after Currency Symbol (System > Manage Currency > Symbols). For example: PKR