get-ssl-inform.php

get-ssl-inform.php

<?php
$g = stream_context_create ([
	"ssl" => ["capture_peer_cert" => true],
	'http' => [
  		'method' => 'GET',
		'user_agent' => 'shouwang.io ssl detector',
		'timeout'=>10
	]
]);
$r = fopen("https://www.baidu.com/", "rb", false, $g);
$cont = stream_context_get_params($r);
$cert = openssl_x509_parse($cont["options"]["ssl"]["peer_certificate"]);


echo $cert['subject']['CN'], "\n";
echo date('Y-m-d H:i:s', $cert['validFrom_time_t']), "\n";
echo date('Y-m-d H:i:s', $cert['validTo_time_t']), "\n";
echo $cert['issuer']['O'],"\n";
echo $cert['issuer']['CN'],"\n";

result:

baidu.com
2017-06-29 08:00:00
2018-08-18 07:59:59
Symantec Corporation
Symantec Class 3 Secure Server CA - G4