PHP window Platform simulation CHECKDNSRR function to detect whether the email is real

In PHP, there is a CHECKDNSRR function in the system function that checks whether it has a DNS record based on a given host name (domain name) or IP address, in order to verify that it is real. However, this function can only be used under Linux systems and does not support Windows platforms. The following is a collection of online hack method, the implementation of the window platform simulation CHECKDNSRR function to detect the existence of an email function!

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'll introduce the parameters of the function:

BOOL CHECKDNSRR (String $host [, String $type = "MX"])

The first parameter we will not say, is the domain name or IP

The second parameter is the resolution type, respectively:

A (address) record is a record of IP addresses for the specified host name (or domain name).

MX record is the specified mail exchange record (default)

The NS record is a record of the specified domain name server, specifying which DNS the domain name will be parsed by.

SOA records are typically used in a secondary DNS server to specify who is the primary server.

The reverse parsing record of the PTR record from the IP point to the domain name

CNAME record alias record

AAAA record is a record pointing to IPv6

A6 Record ditto

The SRV record is the type of resource record that is supported in the DNS server's database and is typically applied to Microsoft's Active Directory settings.

TXT record text information

Any records, all data types

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