PHP cURL并发里的callback那行是什么效能

PHP cURL并发里的callback那行是什么功能？

function rolling_curl($urls, $delay) {
    $queue = curl_multi_init();
    $map = array();

    foreach ($urls as $url) {
        $ch = curl_init();

        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_TIMEOUT, 1);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_HEADER, 0);
        curl_setopt($ch, CURLOPT_NOSIGNAL, true);

        curl_multi_add_handle($queue, $ch);
        $map[(string) $ch] = $url;
    }

    $responses = array();
    do {
        while (($code = curl_multi_exec($queue, $active)) == CURLM_CALL_MULTI_PERFORM) ;

        if ($code != CURLM_OK) { break; }

        // a request was just completed -- find out which one
        while ($done = curl_multi_info_read($queue)) {

            // get the info and content returned on the request
            $info = curl_getinfo($done['handle']);
            $error = curl_error($done['handle']);
            $results = callback(curl_multi_getcontent($done['handle']), $delay);
            $responses[$map[(string) $done['handle']]] = compact('info', 'error', 'results');

            // remove the curl handle that just completed
            curl_multi_remove_handle($queue, $done['handle']);
            curl_close($done['handle']);

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