<?php


// Report simple running errors
error_reporting(E_ERROR | E_WARNING | E_PARSE);

// urls to grab
$hosts = array(
    'http://google.com',
    'http://whatismyip.org',
    'http://fakedomainthatprobablyisntevenregistered.mil',
    'https://google.com',
    'https://whatismyip.org',
    'https://fakedomainthatprobablyisntevenregistered.mil',
);

$curling = array();         //active curl handles
$done = array();            //store finished host => content
$mh = curl_multi_init();
$is_running = null;
$handle_limit = 3;

do {
    //fill up the curl queue at start of reqs and if any urls have finished
    while (sizeof($curling) < $handle_limit && sizeof($hosts) > 0) {
        $host = array_pop($hosts) ;
        $curling[$host] = curl_init( $host );
        curl_setopt( $curling[$host], CURLOPT_CONNECTTIMEOUT, 10 );
        curl_setopt( $curling[$host], CURLOPT_RETURNTRANSFER, true );
        curl_multi_add_handle( $mh, $curling[$host] );
    }

    // run curl
    curl_multi_exec($mh, $is_running);

    //pop finished hosts.
    //curl_multi_remove_handle also removes the downloaded data, so we stash it for later.
    $ready = curl_multi_select($mh);
    $info = curl_multi_info_read($mh);
    if ( $info && $info['msg']==CURLMSG_DONE ) {
        //copy response
        $host = curl_getinfo( $info['handle'], CURLINFO_EFFECTIVE_URL );
        $http_code = curl_getinfo( $info['handle'], CURLINFO_HTTP_CODE );

        /* only keep valid urls */
        if ($http_code) { 
            $content = curl_multi_getcontent( $info['handle'] );
            $done[$host] = $content;
        }
        #print_r(curl_getinfo($info['handle']));

        //remove from queue and close handles.
        curl_multi_remove_handle( $mh, $curling[$host] );
        curl_close( $curling[$host] );
        unset( $curling[$host] );
        #echo "finished: $host\n";
    }

} while ($is_running>0);

foreach($done as $host => $content) {
    #$results = curl_multi_getcontent( $curling[$i] );
    #echo "$i:\n$results\n\n";
    echo "\n$host\n$content\n";
}
 

curl_multi_close($mh);

echo "\ndone\n";

?>