(PHP Extension) DNS Query CAA Records

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Shows how to perform a DNS query to retrieve CAA records.

Note: This example requires Chilkat v9.5.0.96 or later.

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<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

$dns = new CkDns();

$json = new CkJsonObject();
$json->put_EmitCompact(false);

$success = $dns->Query('CAA','zoom.us',$json);
if ($success == false) {
    print $dns->lastErrorText() . "\n";
    exit;
}

print $json->emit() . "\n";

// Sample response.
// Parsing code below..

// {
//   "answer": {
//     "caa": [
//       {
//         "name": "zoom.us",
//         "ttl": 300,
//         "flags": 0,
//         "tag": "iodef",
//         "value": "mailto:security@zoom.us"
//       },
//       {
//         "name": "zoom.us",
//         "ttl": 300,
//         "flags": 0,
//         "tag": "issue",
//         "value": "amazon.com"
//       },
//       {
//         "name": "zoom.us",
//         "ttl": 300,
//         "flags": 0,
//         "tag": "issue",
//         "value": "digicert.com"
//       },
//       {
//         "name": "zoom.us",
//         "ttl": 300,
//         "flags": 0,
//         "tag": "issue",
//         "value": "godaddy.com"
//       },
//       {
//         "name": "zoom.us",
//         "ttl": 300,
//         "flags": 0,
//         "tag": "issue",
//         "value": "letsencrypt.org"
//       },
//       {
//         "name": "zoom.us",
//         "ttl": 300,
//         "flags": 0,
//         "tag": "issue",
//         "value": "pki.goog"
//       },
//       {
//         "name": "zoom.us",
//         "ttl": 300,
//         "flags": 0,
//         "tag": "issue",
//         "value": "sectigo.com"
//       }
//     ]
//   }
// }

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

$i = 0;
$count_i = $json->SizeOfArray('answer.caa');
while ($i < $count_i) {
    $json->put_I($i);
    $name = $json->stringOf('answer.caa[i].name');
    $ttl = $json->IntOf('answer.caa[i].ttl');
    $flags = $json->IntOf('answer.caa[i].flags');
    $tag = $json->stringOf('answer.caa[i].tag');
    $value = $json->stringOf('answer.caa[i].value');
    $i = $i + 1;
}


?>