<?php 
@set_time_limit(0); 

$filename = 'sitesproxy.txt'; 

$n = 15; //количество потоков при проверке проксей 
$regular = '#[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}:[0-9]{2,5}#'; 
$ban = array(); 
$proxy = array(); 
foreach (file($filename) as $url) 
{ 
    $url = trim($url); 
    $page = curlPage($url); 
    preg_match_all($regular, $page, $p); 
    if (!count($p[0])) 
        $ban[] = $url; 
    else 
        $proxy = array_merge($proxy, $p[0]); 
} 
$proxies = __array_unique($proxy); 
$countProxy = count($proxies); 
if ($countProxy <= $n) 
{ 
    chk($proxies); 
} 
else 
{ 
    $c = floor($countProxy / $n); 
    for ($i = 1; $i <= $c; $i++) 
        chk(array_slice($proxies, $n * $i, $n)); 
    chk(array_slice($proxies, $n * ($c + 1), $countProxy - $n * $c)); 
} 
if (count($ban) == 1) 
    echo '<hr>Сайт не принес пользы: ' . $ban[0]; 
if (count($ban) > 1) 
{ 
    echo '<hr>Сайты не приносят пользы:<br>'; 
    foreach ($ban as $sitename) 
        echo $sitename . '<br>'; 
} 
function chk($proxies) 
{ 
    $mc = curl_multi_init (); 
    for ($thread_no = 0; $thread_no < count($proxies); $thread_no++) 
    { 
        $c [$thread_no] = curl_init (); 
        curl_setopt($c [$thread_no], CURLOPT_URL, "http://google.com"); 
        curl_setopt($c [$thread_no], CURLOPT_HEADER, 0); 
        curl_setopt($c [$thread_no], CURLOPT_RETURNTRANSFER, 1); 
        curl_setopt($c [$thread_no], CURLOPT_CONNECTTIMEOUT, 5); 
        curl_setopt($c [$thread_no], CURLOPT_TIMEOUT, 10); 
        curl_setopt($c [$thread_no], CURLOPT_PROXY, trim($proxies [$thread_no])); 
        curl_setopt($c [$thread_no], CURLOPT_PROXYTYPE, 0); 
        curl_multi_add_handle($mc, $c [$thread_no]); 
    } 
    do 
    { 
        while (($execrun = curl_multi_exec($mc, $running)) == CURLM_CALL_MULTI_PERFORM) 
            if ($execrun != CURLM_OK) 
                break; 
        while ($done = curl_multi_info_read($mc)) 
        { 
            $info = curl_getinfo($done ['handle']); 
            if ($info ['http_code'] == 301) 
                echo trim($proxies [array_search($done['handle'], $c)]) . "<br>\r\n"; 
            curl_multi_remove_handle($mc, $done ['handle']); 
        } 
    } while ($running); 
    curl_multi_close($mc); 
} 
function curlPage($url) //curl 
{ 
    if (!function_exists('curl_init')) 
        die('На сервере не установлено или отключено расширение cURL. Скрипт завершил работу.'); 
    $curl = curl_init(); 
    curl_setopt($curl, CURLOPT_URL, $url); 
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); 
    @curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true); 
    curl_setopt($curl, CURLOPT_HTTPHEADER, array( 
        'Accept-Language: ru,en-us;q=0.7,en;q=0.3', 
        'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8,application/json', 
        'User-Agent: Mozilla/5.0 (X11; U; Gentoo-Linux; ru; rv:1.9.2.3)socks-php-bot Gecko/20100404  Firefox/3.7.0 GTB7.0', 
        'Accept-Encoding: deflate', 
        'Accept-Charset: UTF-8,*')); 
    curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 300); 
    return curl_exec($curl); 
} 
function __array_unique($array) 
{ 
    $r = array(); 
    foreach ($array as $key => $value) 
    { 
        if (!in_array($value, $r)) 
            $r[] = $value; 
    } 
    return $r; 
}