Check if Certificate Expired

How to check to see if a digital certificate is expired.

<?php

$cert = new COM("Chilkat.Cert");

//  The LoadByCommonName method searches the registry-based
//  Windows Current User Certificate Store and Local Machine Certificate
//  Store for a certificate whose common name (CN) matches
//  the argument:

$success = $cert->LoadByCommonName('Chilkat Software, Inc.');
if ($success == false) {
    print 'Failed to find certificate!' . "\n";
}
else {

    //  Display the certificate's distinguished name:
    print $cert->subjectDN() . "\n";

    $isExpired = $cert->Expired;
    if ($isExpired == true) {
        print 'Certificate is expired.' . "\n";
    }
    else {
        print 'Certificate is NOT expired.' . "\n";
    }

}

//  Alternatively, load a Certificate from a .cer file.
//  (Certs may also be loaded from other types of files, such as PEM, DER, PFX, etc.)
$success = $cert->LoadFromFile('myCert.cer');
if ($success == false) {
    print 'Failed to load certificate!' . "\n";
}
else {

    //  Display the certificate's distinguished name:
    print $cert->subjectDN() . "\n";

    $isExpired = $cert->Expired;
    if ($isExpired == true) {
        print 'Certificate is expired.' . "\n";
    }
    else {
        print 'Certificate is NOT expired.' . "\n";
    }

}

//  The Chilkat Certificate, Certificate Store, Private Key,
//  Public Key, and Key Container classes / objects are freeware.

//  They are used by and included with the Chilkat Email,
//  Crypt, S/MIME, and other commercial Chilkat components.

?>