检查证书过期

check-ssl-expire.php

<?php
function getSslExpireTime(string $url): int
{
        if(!filter_var($url, FILTER_VALIDATE_URL)) {
            throw new \RuntimeException('invalidate url:'.$url);
        }

        $domain = parse_url($url, PHP_URL_HOST);
        $context = stream_context_create([
            "ssl" => ["capture_peer_cert" => true]
        ]);

        $client = stream_socket_client(
            "ssl://$domain:443",
            $errno,
            $errStr,
            5,
            STREAM_CLIENT_CONNECT,
            $context
        );
        $cert = stream_context_get_params($client);
        $info = openssl_x509_parse($cert['options']['ssl']['peer_certificate']);
        return $info['validTo_time_t'];
}