Obtaining Signature Algorithm with php

[Chris]

I'm getting almost everything I want but can't figure out how to get  
the X509 signature algorithm so I can check for md5 badness.  Any help?

Here's my test php:
<?php
$mode = "ssl";
$host = "pop.gmail.com";
$port = 995;

$ca_roots = 'CertificateStore.pem';

$site_cert = NULL;
$context = stream_context_create();
$result = stream_context_set_option($context, $mode, 'cafile',  
$ca_roots);
$result = stream_context_set_option($context, $mode, 'verify_peer',  
true);
$result = stream_context_set_option($context, $mode,  
'capture_peer_cert', true);
if ($fp = stream_socket_client($mode.'://'.$host.':'.$port.'/',  
$errno, $errstr, 30, STREAM_CLIENT_CONNECT, $context)) {
    if ($options = stream_context_get_options($context)) {
        var_dump($options);
        if (isset($options[$mode]) && isset($options[$mode] 
['peer_certificate'])) {
            $site_cert = $options[$mode]['peer_certificate'];
        }
    }
    fclose($fp);
}
if ($site_cert) {
    openssl_x509_export($site_cert, $str_cert, true);
    echo "Exported:<br>\n";
    print_r($str_cert);

    echo "Read:<br>\n";
    echo openssl_x509_read($site_cert);

    echo "Parse:<br>\n";
    $ssl = openssl_x509_parse($site_cert, true);
    print_r($ssl);

    $pubkey = openssl_pkey_get_public($str_cert);
    $keyinfo = openssl_pkey_get_details($pubkey);
    var_dump($keyinfo);
}


?>

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