(PHP Extension) Get Certificate User Principal Name (UPN)

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Demonstrates how to get a certificate's UPN from the SAN (Subject Alternative Name). Most certificates do not have a UPN. This example only applies to those certificates that have a User Principal Name.

Note: This example requires Chilkat v9.5.0.90 or greater due to fixes made in getting the UPN from the SAN.

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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");

$cert = new CkCert();

$success = $cert->LoadFromFile('qa_data/certs/sample.cer');
if ($success == false) {
    print $cert->lastErrorText() . "\n";
    exit;
}

$xml = new CkXml();
$xml->LoadXml($cert->subjectAlternativeName());
print $xml->getXml() . "\n";

// A certificate with a User Principal Name in the SAN might have this:

// <SubjectAltName>
//     <rfc822Name>joe@example.com</rfc822Name>
//     <name type="oid" oid="1.3.6.1.4.1.311.20.2.3">joe@example.com</name>
// </SubjectAltName>

// The OID 1.3.6.1.4.1.311.20.2.3 is for the User Principal Name.
$upn = $xml->chilkatPath('/A/name,oid,1.3.6.1.4.1.311.20.2.3|*');
if ($xml->get_LastMethodSuccess() == false) {
    print 'No user principle name.' . "\n";
}
else {
    print 'User Principle Name = ' . $upn . "\n";
}


?>