Piwik\Plugin\Visualization::assignTemplateVar PHP Method

    public function assignTemplateVar($vars, $value = null)
    {
        if (is_string($vars)) {
            $this->templateVars[$vars] = $value;
        } elseif (is_array($vars)) {
            foreach ($vars as $key => $value) {
                $this->templateVars[$key] = $value;
            }
        }
    }