Query the DNS of a domain passed to this function. Returns an array of all the DNS info, A, MX, TXT, and NS records

dnsdata.php

<?php
public function getdnsdata( $x ){
      $aRecords = shell_exec("dig +short {$x} a");
      $aArray = explode(PHP_EOL, $aRecords,1);

      $mxRecords = shell_exec("dig +short {$x} mx");
      $mxArray =  explode(PHP_EOL, $mxRecords, -1);

      $txtRecords = shell_exec("dig +short {$x} txt");
      $txtArray = explode(PHP_EOL, $txtRecords, -1);

      $nsRecords = shell_exec("dig +short {$x} ns");
      $nsArray = explode(PHP_EOL, $nsRecords, -1);
      return array(
        "a" => str_replace("\n","",$aArray),
        "mx" => $mxArray,
        "txt" => preg_replace("/[^a-zA-Z0-9 \- \= \: \_ \. \~]/", "", $txtArray),
        "ns" => $nsArray,
      );
    }