AddRssLinkHandler.php

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<?php

namespace Elgg\Page;

class AddRssLinkHandler {
    
    public function __invoke(\Elgg\Event $event) {
        if (!_elgg_has_rss_link()) {
            return;
        }
        
        $head_params = $event->getValue();

        $head_params['links']['rss'] = [
            'rel' => 'alternative',
            'type' => 'application/rss+xml',
            'title' => 'RSS',
            'href' => elgg_http_add_url_query_elements(elgg_get_current_url(), [
                'view' => 'rss',
            ]),
        ];
    
        return $head_params;
    }
}