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(); // 開啟多執行緒
$i = 0;
foreach($url_array as $url) {
$ch = curl_init();
if (IS_PROXY) {
//以下程式碼設定代理伺服器
//代理伺服器地址
 
http://www.cnproxy.com/proxy1.html !!Hong Kong, China的速度比較好
curl_setopt ($ch, CURLOPT_PROXY,'114.238.39.235:36945' );
}
        curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // return don't print
curl_setopt($ch, CURLOPT_TIMEOUT, 30); //設定超時時間
curl_setopt($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); //HTTp定向級別
curl_multi_add_handle($mh, $ch); // 把 curl resource 放進 multi curl handler 裡
$handle[$i++] = $ch;
}
/* 執行 */
do {
$mrc = curl_multi_exec($mh, $running
 
);
if ($wait_usec > 0) /* 每個 connect 要間隔多久 */
usleep($wait_usec); // 250000 = 0.25 sec
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
while ($running && $mrc == CURLM_OK) {
if (curl_multi_select($mh) != -1) {
do {
$mrc = curl_multi_exec($mh, $running);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
}
    }
/* 讀取資料 */
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;
}