Phpwindow platform simulates the checkdnsrr function to check whether the email actually exists _ PHP Tutorial

The phpwindow platform simulates the checkdnsrr function to check whether the email actually exists. There is a checkdnsrr function in the php system function. This function is used to check whether a DNS record exists based on a given hostname or IP address, the purpose is to check whether there is a checkdnsrr function in the php system function. the function is used to check whether a DNS record exists based on a given host name or IP address, the purpose is to check whether it actually exists. However, this function can only be used in linux and does not support windows. The following is a hack method collected on the internet. it simulates the checkdnsrr function on the window platform to check whether an email exists!

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;    }}

Next I will introduce the parameters of this function:

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

The first parameter is the domain name or ip address.

The second parameter is the resolution type, which includes:

The A (Address) record is the IP Address record corresponding to the specified host name (or domain name.

MX record is the specified mail exchange record (default)

An NS record is a record of a domain name server. it specifies the DNS to which the domain name is resolved.

SOA records are generally used in secondary dns servers to specify who is the primary server.

PTR record reverse resolution record pointing from ip to domain name

CNAME record alias record

The AAAA record is a record pointing to IPv6.

A6 record is the same as above

The SRV record is a type of resource record supported by the database of the DNS server. it is generally used when setting the Active Directory of Microsoft.

TXT records text information

ANY records, all data types

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Your name (domain name) or IP address check whether it has a DNS record, the purpose is to check whether it is...