$connomains = array(
"//www.jb51.net/",
"http://www.163.com/",
"http://www.sina.com.cn/"
);
$mh = curl_multi_init();
foreach ($connomains as $i => $url) {
   $conn[$i]=curl_init($url);
   curl_setopt($conn[$i],CURLOPT_RETURNTRANSFER,1);
   curl_multi_add_handle ($mh,$conn[$i]);
}
do { $n=curl_multi_exec($mh,$active); } while ($active);
foreach ($connomains as $i => $url) {
   $res[$i]=curl_multi_getcontent($conn[$i]);
   curl_close($conn[$i]);
}
print_r($res);

do { $n=curl_multi_exec($mh,$active); } while ($active);

do {
   $mrc = curl_multi_exec($mh,$active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
while ($active and $mrc == CURLM_OK) {
    if (curl_multi_select($mh) != -1) {
      do {
          $mrc = curl_multi_exec($mh, $active);
      } while ($mrc == CURLM_CALL_MULTI_PERFORM);
    }
}

curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);

curl_error($conn[$i]);

<"//www.jb51.net/");
curl_setopt($ch1, CURLOPT_HEADER, 0);
curl_setopt($ch2, CURLOPT_URL, "http://www.baidu.com/");
curl_setopt($ch2, CURLOPT_HEADER, 0);
// 创建批处理cURL句柄
$mh = curl_multi_init();
// 增加2个句柄
curl_multi_add_handle($mh,$ch1);
curl_multi_add_handle($mh,$ch2);
$running=null;
// 执行批处理句柄
do {
  curl_multi_exec($mh,$running);
} while($running > 0);
// 关闭全部句柄
curl_multi_remove_handle($mh, $ch1);
curl_multi_remove_handle($mh, $ch2);
curl_multi_close($mh);
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