php 通過網站域名獲取SSL證書到期時間

記錄：PHP 通過網站域名去獲取SSL證書的到期時間

    //查詢入口
    public function testOp(){
        $domain = ''; //網站域名
        $cert_info = $this->get_cert_info($domain);
        $dn = $cert_info['subject']['CN']; //證書保護域名
        $validFrom_time_t = date('Y-m-d H:i:s', $cert_info['validFrom_time_t']); //證書開始時間
        $validTo_time_d = date('Y-m-d H:i:s', $cert_info['validTo_time_t']); //證書結束時間

        echo "+-證書保護域名：" . $dn . " -+------------------+\n";
        echo "+-證書開始時間：" . $validFrom_time_t . " -+------------------+\n";
        echo "+-證書結束時間：" . $validTo_time_d . " -+------------------+\n";
        echo '<pre>';print_r($cert_info);
    }
    public function get_cert_info($domain){
        set_time_limit(100);
        $context = stream_context_create(['ssl' => [
            'capture_peer_cert' => true,
            'capture_peer_cert_chain' => true,
            ],
        ]);

        $client = stream_socket_client("ssl://".$domain.":443", $errno, $errstr, 30, STREAM_CLIENT_CONNECT, $context);
        if($client==false) {
            return false;
        }
        $params = stream_context_get_params($client);
        $cert = $params['options']['ssl']['peer_certificate'];
        $cert_info = openssl_x509_parse($cert);
        return $cert_info;
    }

結果示例：