使用php获取网站ip

问题不在于http重定向(高于gethostbyname运行的级别),但lappusa.com无法解析为任何IP地址,因此无法在任何浏览器中加载.你的浏览器做了什么是自动尝试预先添加www ..

您可以在代码中重现该行为.另请注意,多个IP(版本4和6)可以与一个域关联：

<?PHP
function getAddresses($domain) {
  $records = dns_get_record($domain);
  $res = array();
  foreach ($records as $r) {
    if ($r['host'] != $domain) conTinue; // glue entry
    if (!isset($r['type'])) conTinue; // DNSSec

    if ($r['type'] == 'A') $res[] = $r['ip'];
    if ($r['type'] == 'AAAA') $res[] = $r['ipv6'];
  }
  return $res;
}

function getAddresses_www($domain) {
  $res = getAddresses($domain);
  if (count($res) == 0) {
    $res = getAddresses('www.' . $domain);
  }
  return $res;
}

print_r(getAddresses_www('lappusa.com'));
/* outputs Array (
  [0] => 66.11.155.215
) */
print_r(getAddresses_www('example.net'));
/* outputs Array (
  [0] => 192.0.43.10
  [1] => 2001:500:88:200::10
) */