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Код

$started = time();
// checking proxies:
$proxy_list = explode("\n", str_replace("\r", '', $proxylist));
$proxy_count = count($proxy_list);
$curl_common_opt = array(    CURLOPT_URL => $dest_host.'/test.php',
            CURLOPT_RETURNTRANSFER => 1,
            CURLOPT_HEADER => false,
            //CURLOPT_LOW_SPEED_LIMIT => 2048,
            //CURLOPT_LOW_SPEED_TIME => 10,
            CURLOPT_TIMEOUT => 30,
            //CURLOPT_CONNECTTIMEOUT => 10,
            CURLOPT_USERAGENT => 'Transferer sender',
            CURLOPT_POST => 1,
            CURLOPT_PROXYTYPE => CURLPROXY_SOCKS5);
$curl_master = curl_multi_init();
$curl_handlers = array();

for ($i = 0; $i < $proxy_count; $i++)
// preparing multi curl task:
{
    $curl_handlers[$i] = curl_init();
    curl_setopt_array($curl_handlers[$i],    $curl_common_opt +
                    array(CURLOPT_PROXY => $proxy_list[$i],
                    CURLOPT_PROXYUSERPWD => "user:password",
                    CURLOPT_POSTFIELDS => 'command=Test'));
    curl_multi_add_handle($curl_master, $curl_handlers[$i]);
}

$going = $proxy_count;
do
// implementing multi curl task:
{
    if (@file_exists(DIR_CONTROLERS."/stop")) die('Manual stop');

    curl_multi_exec($curl_master, $running);
    if ($running < $going)
    {
        echo ($going-$running)." proxy test completed. now testing ".$running." proxies<br>\n";
        $going = $running;
    }
    sleep(2);
    echo "ch prx ($running); time: ".time()."<br>\n";
}
while ($running > 0);

for($i = 0; $i < $proxy_count; $i++)
// capturing multi task results:
{
    $result = curl_multi_getcontent($curl_handlers[$i]);
    if (curl_errno($curl_handlers[$i]) || $result != 'Test OK')
    // if page was not got (proxy down):
    {
        if ($show_report) echo "Proxy ".$proxy_list[$i]." is down<br>\n";
        echo curl_error($curl_handlers[$i])."<br>\n";
        echo $result."<br>\n---------------------<br>\n";
        unset($proxy_list[$i]);
    }
    curl_multi_remove_handle($curl_master, $curl_handlers[$i]);
    curl_close($curl_handlers[$i]);
}
$proxy_list = array_merge($proxy_list, array());
echo "test took ".(time()-$started)." sec.<br>\n";
if (!count($proxy_list)) die("All proxies are down<br>\n");

die('test completed');