MultiCurlHead.php

<?php

function getHead($urls){
    $results = array();
    // make sure the rolling window isn't greater than the # of urls
    $rolling_window = 5;
    $rolling_window = (sizeof($urls) < $rolling_window) ? sizeof($urls) : $rolling_window;

    $master = curl_multi_init();
    // $curl_arr = array();