PHPDNSWrapper

<?php

class Dns {

    public $hostname;
    public $txt;
    public $spf;
    public $dkim;
    public $dkimTxt;

    public $dkimSelector;

    public function __construct($hostname, $dkimSelector) {
        //fetch DNS TXT records for now
        $this->hostname = $hostname;
        $this->dkimSelector = $dkimSelector;
        $this->txt = dns_get_record($hostname, DNS_TXT);
        $this->dkimTxt = dns_get_record($dkimSelector.'._domainkey.'.$hostname, DNS_TXT);
        $this->_parseSPFAndDKIMRecords();
    }

    private function _parseSPFAndDKIMRecords() {
        // echo '<pre>';
        // print_r($this->txt);
        // print_r($this->dkimTxt);
        // echo '</pre>';
        if(isset($this->txt) && !empty($this->txt)) {
            foreach($this->txt as $txtRecordIndex => $txtRecord) {
                if(strpos($txtRecord['txt'], 'spf')) {
                    $this->spf = $txtRecord['txt'];
                    continue;
                }
            }
        }

        if(isset($this->dkimTxt) && !empty($this->dkimTxt)) {
            foreach($this->dkimTxt as $txtRecordIndex => $txtRecord) {
                if(strpos($txtRecord['host'], '_domainkey')) {
                    $this->dkim = $txtRecord['txt'];
                    continue;
                }
            }
        }
    }

    public function checkSPF($spf) {
        return $this->spf == $spf ? "✓" : "❌";;
    }

    public function checkDKIM($dkim) {
        return $this->dkim == $dkim ? "✓" : "❌";
    }
}