PHP/Network/DNS

Check DNS error

   <source lang="html4strict">

<?php

  $email = "j@wbex.ru";
  $domain = explode("@",$email);
  $valid = checkdnsrr($domain[1], "ANY");
  if($valid) 
     echo "The domain has an MX record!";
  else 
     echo "Cannot locate MX record for $domain[1]!";

?>

      </source>
   
  

Get MX records corresponding to a given Internet host name

   <source lang="html4strict">

<?php

  getmxrr("www.wbex.ru",$mxhosts);
  print_r($mxhosts);

?>

      </source>
   
  

getservbyname: get server by name

   <source lang="html4strict">

<?php

  echo "HTTP"s default port number is: ".getservbyname("http", "tcp");

?>

      </source>
   
  

getservbyport: get server by port

   <source lang="html4strict">

<?php

  echo "Port 80"s default service is: ".getservbyport(80, "tcp");

?>

      </source>