多个

header("Content-type: text/html; charset=utf-8"); 
$connomains = array(
"https://www.btc123.com/api/getTicker?symbol=huobibtccny",
"https://www.btc123.com/api/getTicker?symbol=huobiltccny"
);

$mh = curl_multi_init();

foreach ($connomains as $i => $url) {
     $conn[$i]=curl_init($url);
      curl_setopt($conn[$i],CURLOPT_RETURNTRANSFER,1);
      curl_setopt($conn[$i], CURLOPT_SSL_VERIFYPEER, false); //https支持
      curl_setopt($conn[$i], CURLOPT_SSL_VERIFYHOST, false); //https支持
      curl_multi_add_handle ($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);

单个

$url = "https://tieba.baidu.com/p/500269756644?red_tag=05673359941";
$mh = curl_multi_init();

$conn=curl_init($url);
curl_setopt($conn,CURLOPT_RETURNTRANSFER,1);
curl_setopt($conn, CURLOPT_SSL_VERIFYPEER, false); //https支持
curl_setopt($conn, CURLOPT_SSL_VERIFYHOST, false); //https支持
curl_multi_add_handle ($mh,$conn);
        
do { $n=curl_multi_exec($mh,$active); } while ($active);
$res=curl_multi_getcontent($conn);
curl_close($conn);
print_r($res);