php 获取 SSL 信息

class SSL {

    public $domain, $validFrom, $validTo, $issuer, $validity, $validitytot, $crtValRemaining;

    private static function instantiate($url, $info) {
        $obj = new static;
        $obj->domain = $url;
        $obj->validFrom = $info['validFrom'];
        $obj->validTo = $info['validTo'];
        $obj->issuer = $info['issuer'];
        $obj->validity = $info['validity'];
        $obj->validitytot = $info['validitytot'];
        $obj->crtValRemaining = $info['crtValRemaining'];

        return $obj;
    }

    public static function getSSLinfo($url) {
        $ssl_info = [];
        $certinfo = static::getCertificateDetails($url);
        $validFrom_time_t_m = static::dateFormatMonth($certinfo['validFrom_time_t']);
        $validTo_time_t_m = static::dateFormatMonth($certinfo['validTo_time_t']);

        $validFrom_time_t = static::dateFormat($certinfo['validFrom_time_t']);
        $validTo_time_t = static::dateFormat($certinfo['validTo_time_t']);
        $current_t = static::dateFormat(time());

        $ssl_info['validFrom'] = $validFrom_time_t_m;
        $ssl_info['validTo'] = $validTo_time_t_m;
        $ssl_info['issuer'] = $certinfo['issuer']['O'];

        $ssl_info['validity'] = static::diffDate($current_t, $validTo_time_t)." days";
        $ssl_info['validitytot'] = (static::diffDate($validFrom_time_t, $validTo_time_t)-1).' days';

        $ssl_info['crtValRemaining'] =$certinfo['validTo_time_t'];

        return static::instantiate($url, $ssl_info); // return an object
    }

    private static function getCertificateDetails($url) {
        $urlStr = strtolower(trim($url)); 

        $parsed = parse_url($urlStr);// add http://
        if (empty($parsed['scheme'])) {
            $urlStr = 'http://' . ltrim($urlStr, '/');
        }
        $orignal_parse = parse_url($urlStr, PHP_URL_HOST);
        $get = stream_context_create(array("ssl" => array("capture_peer_cert" => TRUE)));
        $read = stream_socket_client("ssl://".$orignal_parse.":443", $errno, $errstr, 30, STREAM_CLIENT_CONNECT, $get);
        $cert = stream_context_get_params($read);
        $certinfo = openssl_x509_parse($cert['options']['ssl']['peer_certificate']);
        return $certinfo;
    }

    private static function dateFormat($stamp) {
        return  strftime("%Y-%m-%d", $stamp);
    }

    private static function dateFormatMonth($stamp) {
        return  strftime("%Y-%b-%d", $stamp);
    }

    private static function diffDate($from, $to) {
        $date1=date_create($from);
        $date2=date_create($to);
        $diff=date_diff($date1,$date2);
        return ltrim($diff->format("%R%a"), "+");
    }

}

用法：

$certInfo = SSL::getSSLinfo('stackoverflow.com'); 
echo $certInfo->validFrom .'<br>';
echo $certInfo->validTo .'<br>';
echo $certInfo->issuer .'<br>';
echo $certInfo->validity .'<br>';
echo $certInfo->validitytot .'<br>';
echo $certInfo->crtValRemaining .'<br>';

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