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php window平台模拟checkdnsrr函数检测email是否真实存在

Jun 13, 2016 am 09:33 AM
email php windows

在php的系统函数中有一个checkdnsrr函数,该函数的作用是根据一个给定的host name(域名)或者IP地址检查它是否有DNS记录,目的就是检验它是否真实存在。但是该函数仅可以在linux系统下使用,并不支持windows平台。下面是网上搜集到的一个hack的方法,实现在window平台上模拟checkdnsrr函数来检测一个email是否存在的功能!

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if(!function_exists('checkdnsrr')){

    function checkdnsrr($host,$type=''){

        if(!empty($host)){

            $type=(empty($type))?'MX':$type;

            exec('nslookup -type='.$type.' '.escapeshellcmd($host),$result);

            $it=new ArrayIterator($result);

            foreach(new RegexIterator($it,'~^'.$host.'~',RegexIterator::GET_MATCH) as $result){

                if($result){

                    return true;

                }             

            }

        }

        return false;

    }

}

Copy after login

接下来我来介绍一下该函数的参数:

bool checkdnsrr ( string $host [, string $type = "MX" ] )

第一个参数我们就不说了,就是域名或者ip

第二个参数是解析类型,分别有:

A (Address) 记录     是指定主机名(或域名)对应的IP地址记录。

MX 记录              是指定邮件交换记录(默认)

NS 记录              是指定域名服务器的记录,指定该域名由哪个DNS来进行解析。

SOA记录              一般在辅助的dns服务器里才用到,用来指定谁是主服务器。

PTR记录              从ip指向域名的反向解析记录

CNAME记录            别名记录

AAAA记录             是一个指向IPv6的记录

A6记录               同上

SRV记录              它是DNS服务器的数据库中支持的一种资源记录的类型,一般是为Microsoft的活动目录设置时的应用。

TXT记录              文本信息

ANY记录              任何记录,所有数据类型

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