PHP 网络函数

PHP dns_get_record() 函数获取与给定主机名关联的 DNS 资源记录。

语法

dns_get_record(hostname, type, authns, addtl, raw)

参数

hostname必填。 指定主机名（例如"www.yxjc123.com"）。
type可选。 指定要搜索的资源记录类型。它可以是以下任意一项:
  • DNS_A
  • DNS_CNAME
  • DNS_HINFO
  • DNS_CAA
  • DNS_MX
  • DNS_NS
  • DNS_PTR
  • DNS_SOA
  • DNS_TXT
  • DNS_AAAA
  • DNS_SRV
  • DNS_NAPTR
  • DNS_A6
  • DNS_ALL
  • DNS_ANY
authns可选。 通过引用传递，如果给定，将使用权威名称服务器的资源记录进行填充。
addtl可选。 通过引用传递，如果给出，将填充任何附加记录。
row可选。 如果设置为 true，type 将被解释为原始 DNS 类型 ID。返回值会包含一个数据key，需要手动解析。默认值为 false。

返回值

返回关联数组的数组，失败时返回 false。每个关联数组至少包含以下键:

  • host - 主机名。
  • class - 仅返回 Internet 类记录并始终返回 IN。
  • type - 记录类型。数组中的其他属性取决于 type 参数。
  • ttl - 此记录剩余的"生存时间"（原始 ttl 减去自权威名称以来已过去的时间长度）服务器被查询）。

数组中的其他键取决于type参数。

示例:dns_get_record() 示例

下面的示例显示了dns_get_record()函数的用法。

<?php
$result = dns_get_record("baidu.com");
print_r($result);
?>

上述代码的输出将是:

Array
(
    [0] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 2031
            [type] => MX
            [pri] => 20
            [target] => jpmx.baidu.com
        )

    [1] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 2031
            [type] => MX
            [pri] => 20
            [target] => usmx01.baidu.com
        )

    [2] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 2031
            [type] => MX
            [pri] => 20
            [target] => mx50.baidu.com
        )

    [3] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 2031
            [type] => MX
            [pri] => 10
            [target] => mx.maillb.baidu.com
        )

    [4] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 2031
            [type] => MX
            [pri] => 20
            [target] => mx1.baidu.com
        )

    [5] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 2031
            [type] => MX
            [pri] => 15
            [target] => mx.n.shifen.com
        )

    [6] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 3972
            [type] => SOA
            [mname] => dns.baidu.com
            [rname] => sa.baidu.com
            [serial] => 2012147728
            [refresh] => 300
            [retry] => 300
            [expire] => 2592000
            [minimum-ttl] => 7200
        )

    [7] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 3971
            [type] => NS
            [target] => ns3.baidu.com
        )

    [8] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 3971
            [type] => NS
            [target] => dns.baidu.com
        )

    [9] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 3971
            [type] => NS
            [target] => ns7.baidu.com
        )

    [10] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 3971
            [type] => NS
            [target] => ns4.baidu.com
        )

    [11] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 3971
            [type] => NS
            [target] => ns2.baidu.com
        )

)

示例:使用类型参数

再考虑一个示例，说明如何使用 使用此函数输入参数。

<?php
$result = dns_get_record("baidu.com", DNS_MX);
print_r($result);
?>

上述代码的输出将是:

Array
(
    [0] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 2832
            [type] => MX
            [pri] => 10
            [target] => mx.maillb.baidu.com
        )

    [1] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 2832
            [type] => MX
            [pri] => 15
            [target] => mx.n.shifen.com
        )

    [2] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 2832
            [type] => MX
            [pri] => 20
            [target] => mx1.baidu.com
        )

    [3] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 2832
            [type] => MX
            [pri] => 20
            [target] => jpmx.baidu.com
        )

    [4] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 2832
            [type] => MX
            [pri] => 20
            [target] => mx50.baidu.com
        )

    [5] => Array
        (
            [host] => baidu.com
            [class] => IN
            [ttl] => 2832
            [type] => MX
            [pri] => 20
            [target] => usmx01.baidu.com
        )

)