使用PHP检查SSL证书哈希

<?php
function get_ssl_certificate_hash($domain) {
    $context = stream_context_create([
        'ssl' => [
            'capture_session_meta' => true,
        ],
    ]);

    $socket = stream_socket_client("ssl://$domain:443", $errno, $errstr, 30, STREAM_CLIENT_CONNECT, $context);

    if (!$socket) {
        throw new Exception("Failed to connect to $domain: $errstr ($errno)");
    }

    $meta = stream_get_meta_data($socket);
    $cert = $meta['ssl']['peer_certificate'];

    if (!$cert) {
        throw new Exception("Failed to retrieve SSL certificate for $domain");
    }

    openssl_x509_free($cert);

    return hash('sha256', $cert);
}

try {
    $domain = 'example.com';
    $hash = get_ssl_certificate_hash($domain);
    echo "SSL Certificate Hash for $domain: $hash\n";
} catch (Exception $e) {
    echo "Error: " . $e->getMessage() . "\n";
}
?>