root/devel-backup/search/rss.php

<?php

    //    ELGG search through everything page

    // Run includes
        require("../includes.php");
        
        run("search:init");
        run("search:all:tagtypes");

        $output = run("search:all:display:rss", $_REQUEST['tag']);
        
        if ($output) {
            header("Pragma: public");
            header("Cache-Control: public"); 
            
            // no time data on this RSS, at least not without rewriting some function outputs
            
            $if_none_match = preg_replace('/[^0-9a-f]/', '', $_SERVER['HTTP_IF_NONE_MATCH']);
            
            $etag = md5($output);
            
            if ($if_none_match == $etag) {
                header("{$_SERVER['SERVER_PROTOCOL']} 304 Not Modified");
                exit;
            }
            
            header("Content-Length: " . strlen($output));
            header('ETag: "' . $etag . '"');
            
            header("Content-type: text/xml");
            echo $output;
        }
?>