curl 多进程并发访问函数

function multiCurl($urls, $delay=3)
{
$queue = curl_multi_init();
$map = array();

foreach ($urls as $url)
{
// create cURL resources
$ch = curl_init();

// 设置 URL 和 其他参数
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_TIMEOUT, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_NOSIGNAL, true);

// 把当前 curl resources 加入到 curl_multi_init 队列
curl_multi_add_handle($queue, $ch);
$map[$url] = $ch;
}

$active = null;

// execute the handles
do {
$mrc = curl_multi_exec($queue, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);

while ($active > 0 && $mrc == CURLM_OK) {
while (curl_multi_exec($queue, $active) === CURLM_CALL_MULTI_PERFORM);
// 这里 curl_multi_select 一直返回 -1，所以这里就死循环了，CPU就100%了
if (curl_multi_select($queue, 0.5) != -1)
{
do {
$mrc = curl_multi_exec($queue, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
}
}

$responses = array();
foreach ($map as $url=>$ch) {
//$responses[$url] = callback(curl_multi_getcontent($ch), $delay);
$responses[$url] = curl_multi_getcontent($ch);
curl_multi_remove_handle($queue, $ch);
curl_close($ch);
}

curl_multi_close($queue);
return $responses;
}