Graby\SiteConfig\ConfigBuilder::mergeConfig PHP Method

    public function mergeConfig(SiteConfig $currentConfig, SiteConfig $newConfig)
    {
        // check for commands where we accept multiple statements (no test_url)
        foreach (array('title', 'body', 'strip', 'strip_id_or_class', 'strip_image_src', 'single_page_link', 'next_page_link') as $var) {
            // append array elements for this config variable from $newConfig to this config
            $currentConfig->{$var} = array_unique(array_merge($currentConfig->{$var}, $newConfig->{$var}));
        }
        // check for single statement commands
        // we do not overwrite existing non null values
        foreach (array('tidy', 'prune', 'parser', 'autodetect_on_failure', 'requires_login') as $var) {
            if ($currentConfig->{$var} === null) {
                $currentConfig->{$var} = $newConfig->{$var};
            }
        }
        // treat find_string and replace_string separately (don't apply array_unique) (thanks fabrizio!)
        foreach (array('find_string', 'replace_string') as $var) {
            // append array elements for this config variable from $newConfig to this config
            $currentConfig->{$var} = array_merge($currentConfig->{$var}, $newConfig->{$var});
        }
        // merge http_header array from currentConfig into newConfig
        // because final values override former values in case of named keys
        $currentConfig->http_header = array_merge($newConfig->http_header, $currentConfig->http_header);
        return $currentConfig;
    }