PHP使用CURL同步抓取多个网页

function async_get_url($url_array, $wait_usec = 0)
{
if (!is_array($url_array))
return false;

$wait_usec = intval($wait_usec);

$data = array();
$handle = array();
$running = 0;

$mh = curl_multi_init(); // multi curl handler

$i = 0;
foreach($url_array as $url) {
$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // return don't print
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)');
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); // 302 redirect
curl_setopt($ch, CURLOPT_MAXREDIRS, 7);

curl_multi_add_handle($mh, $ch); // 把 curl resource 放进 multi curl handler 里

$handle[$i++] = $ch;
}

/* 执行 */
do {
curl_multi_exec($mh, $running);

if ($wait_usec > 0) /* 每个 connect 要间隔多久 */
usleep($wait_usec); // 250000 = 0.25 sec
} while ($running > 0);

/* 读取资料 */
foreach($handle as $i => $ch) {
$content = curl_multi_getcontent($ch);
$data[$i] = (curl_errno($ch) == 0) ? $content : false;
}

/* 移除 handle*/
foreach($handle as $ch) {
curl_multi_remove_handle($mh, $ch);
}

curl_multi_close($mh);

return $data;
}
?>