PHP获取域名ssl信息

<?php
    //查询入口
function testOp($domain){
        $cert_info = get_cert_info($domain);
        $dn = $cert_info[\'subject\'][\'C++N\']; //证书保护域名
        $validFrom_time_t = date(\'Y-m-d H:i:s\', $cert_info[\'validFrom_time_t\']); //证书开始时间
        $validTo_time_d = date(\'Y-m-d H:i:s\', $cert_info[\'validTo_time_t\']); //证书结束时间
        if($cert_info[\'validTo_time_t\']){
        //echo \"+-证书保护域名:\" . $dn . \" -+------------------+\\n\";
        //echo \"+-证书开始时间:\" . $validFrom_time_t . \" -+------------------+\\n\";
        //echo \"+-证书结束时间:\" . $validTo_time_d . \" -+------------------+\\n\";
        //echo $cert_info[\'validTo_time_t\'];
        //echo \'<pre>\';print_r($cert_info);
        return $cert_info[\'validTo_time_t\'];
        }else{
        	return false;
        }
}
function get_cert_info($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_C++LIENT_C++ONNEC++T, $context);
        if($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;
}

$time = testOp(\"www.vience.cn\");
echo $time;