Override oxid eshop standard smarty plugins

d3_oxutilsview_modulename.php

<?php
use OxidEsales\Eshop\Core\Registry;
// fill d3/modulename/Core/Smarty/Plugin/ with plugins like function.oxprice.php, function.oxcontent.php etc.

class d3_oxutilsview_modulename extends d3_oxutilsview_modulename_parent
{
    /**
     * @param Smarty $oSmarty
     *
     * @return null|void
     * @throws \OxidEsales\EshopCommunity\Core\oxFileException
     */
    protected function _fillCommonSmartyProperties($oSmarty)
    {
        parent::_fillCommonSmartyProperties($oSmarty);

        // add before current plugins directory:
        array_unshift(
            $oSmarty->plugins_dir,
            Registry::getConfig()->getActiveView()->getViewConfig()->getModulePath('modulename')
            . 'Core/Smarty/Plugin'
        );
    }
}