Let’s Encrypt免费证书除非3个月有效期，到期需要续签。
固然像宝塔一样的面板在申请证书后会主动增加crontab任务，主动续签。但是偶然候需要手动去检测证书失期情况，以免失期了还不晓得。
因而就想着通过PHP来检测证书的失期时间，然后发送方糖告知。
核心
通过PHP里的Streams扩展功能（stream_context_create、stream_socket_client等）函数建立并返回1个资源流，然后通过openssl_x509_parse函数解析证书信息
stream_context_create函数详解：http://www.php.net/manual/zh/book.stream.php
代码
下载：https://file.bugxia.com/s/KN6t7y7drYH92Tr
//需要检查的域名数组
$domains = array(
"bugxia.com",
"baidu.com"
);
foreach($domains as $domain){
$result = check($domain);
echo $domain." ---- ".$result."
";
}
//检测证书信息
function check($domain){
$stream_option = array(
"ssl" => array(
"capture_peer_cert_chain" => true
)
);
$stream = stream_context_create($stream_option);
$stream_client = stream_socket_client("ssl://".$domain.":443", $errno, $errstr, 20, STREAM_CLIENT_CONNECT, $stream);
if(!$stream_client){
return "产生错误，错误代码：".$errno;
}
$stream_info = stream_context_get_params($stream_client);
stream_socket_shutdown($stream_client, STREAM_SHUT_WR);
foreach ($stream_info["options"]["ssl"]["peer_certificate_chain"] as $cert) {
$cerInfo = openssl_x509_parse($cert);
if(strstr($cerInfo["extensions"]["subjectAltName"],"DNS:".$domain) != false){
return expireLeft($cerInfo['validTo_time_t']);
if($cerInfo['validTo_time_t'] - time() < 86400){
sendFTQQ($domain);
}
}else{
return "未发现该证书对应的域名：".$cerInfo["extensions"]["subjectAltName"];
}
}
}
//证书到期时间格式化
function expireLeft($exp_time){
$sec = $exp_time - time();
switch ($sec)
{
case $sec<0:
return "已失期";
break;
case $sec > 0 and $sec < 61:
return $c."秒";
break;
case $sec < 3600 and $sec > 60:
return round($c/60,0)."分钟";
break;
case $sec < 86401 and $sec > 3600:
return round($c/3600,0)."小时";
break;
case $sec > 86400:
return floor($sec/86400)."天";
break;
}
}
//方糖告知
//申请地址：http://sc.ftqq.com/3.version
function sendFTQQ($domain){
$SCKEY = "方糖KEY";
$url = 'https://sc.ftqq.com/'.$SCKEY.'.send?desp='.urlencode($domain).'&text='.urlencode("域名证书到期告知");
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
curl_setopt($ch, CURLOPT_SSLVERSION , CURL_SSLVERSION_DEFAULT);
curl_setopt($ch, CURLOPT_POST, TRUE);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($ch);
curl_close($ch);
return;
}
?>
参考文献： https://host.fubi.hk/foreshadowinghost/zhishiku/20181026/8424.html
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