php获取https证书详细信息，过期时间

可用于检测https证书是否过期，用于域名证书的过期提醒等等

<?php

$contextOptions = [
    'ssl' => [
        'verify_host' => false,
        'verify_peer' => false,
        'verify_peer_name' => false,
        'capture_peer_cert' => true,
        'capture_peer_cert_chain' => true,
    ]
];//参数不验证远程主机
$context = stream_context_create($contextOptions);
$res = stream_socket_client('ssl://www.phpip.com:443', $errno, $errstr, 30, STREAM_CLIENT_CONNECT, $context);
//var_dump($res);

$params = stream_context_get_params($res);
print_r($params);

$cert = $params['options']['ssl']['peer_certificate'];
$cert_info = openssl_x509_parse($cert);
print_r($cert_info);
echo "过期时间:".date('Y-m-d',$cert_info['validTo_time_t']);
echo "\n";

Array
(
    [options] => Array
        (
            [ssl] => Array
                (
                    [verify_host] => 
                    [verify_peer] => 
                    [verify_peer_name] => 
                    [capture_peer_cert] => 1
                    [capture_peer_cert_chain] => 1
                    [peer_certificate] => Resource id #6
                    [peer_certificate_chain] => Array
                        (
                            [0] => Resource id #7
                            [1] => Resource id #8
                        )

                )

        )

)
Array
(
    [name] => /CN=8100.cc
    [subject] => Array
        (
            [CN] => 8100.cc
        )

    [hash] => df0f486a
    [issuer] => Array
        (
            [C] => US
            [O] => Let's Encrypt
            [CN] => Let's Encrypt Authority X3
        )

    [version] => 2
    [serialNumber] => 0x03DF9881A2B75F6A87731EDE5E87716994A4
    [serialNumberHex] => 03DF9881A2B75F6A87731EDE5E87716994A4
    [validFrom] => 190218043715Z
    [validTo] => 190519043715Z
    [validFrom_time_t] => 1550464635
    [validTo_time_t] => 1558240635
    [signatureTypeSN] => RSA-SHA256
    [signatureTypeLN] => sha256WithRSAEncryption
    [signatureTypeNID] => 668
    [purposes] => Array
        (
            [1] => Array
                (
                    [0] => 1
                    [1] => 
                    [2] => sslclient
                )

            [2] => Array
                (
                    [0] => 1
                    [1] => 
                    [2] => sslserver
                )

            [3] => Array
                (
                    [0] => 1
                    [1] => 
                    [2] => nssslserver
                )

            [4] => Array
                (
                    [0] => 
                    [1] => 
                    [2] => smimesign
                )

            [5] => Array
                (
                    [0] => 
                    [1] => 
                    [2] => smimeencrypt
                )

            [6] => Array
                (
                    [0] => 
                    [1] => 
                    [2] => crlsign
                )

            [7] => Array
                (
                    [0] => 1
                    [1] => 1
                    [2] => any
                )

            [8] => Array
                (
                    [0] => 1
                    [1] => 
                    [2] => ocsphelper
                )

            [9] => Array
                (
                    [0] => 
                    [1] => 
                    [2] => timestampsign
                )

        )

    [extensions] => Array
        (
            [keyUsage] => Digital Signature, Key Encipherment
            [extendedKeyUsage] => TLS Web Server Authentication, TLS Web Client Authentication
            [basicConstraints] => CA:FALSE
            [subjectKeyIdentifier] => 97:68:84:CA:0E:DE:61:BD:91:C9:3A:E3:C9:50:B2:43:81:26:E5:E7
            [authorityKeyIdentifier] => keyid:A8:4A:6A:63:04:7D:DD:BA:E6:D1:39:B7:A6:45:65:EF:F3:A8:EC:A1

            [authorityInfoAccess] => OCSP - URI:http://ocsp.int-x3.letsencrypt.org
CA Issuers - URI:http://cert.int-x3.letsencrypt.org/

            [subjectAltName] => DNS:8100.cc
            [certificatePolicies] => Policy: 2.23.140.1.2.1
Policy: 1.3.6.1.4.1.44947.1.1.1
  CPS: http://cps.letsencrypt.org

            [ct_precert_scts] => Signed Certificate Timestamp:
    Version   : v1 (0x0)
    Log ID    : E2:69:4B:AE:26:E8:E9:40:09:E8:86:1B:B6:3B:83:D4:
                3E:E7:FE:74:88:FB:A4:8F:28:93:01:9D:DD:F1:DB:FE
    Timestamp : Feb 18 05:37:15.226 2019 GMT
    Extensions: none
    Signature : ecdsa-with-SHA256
                30:45:02:20:0E:EF:54:91:AD:1D:EB:A6:32:9A:B1:6A:
                D9:D4:DF:C0:B9:A2:63:0C:86:67:59:79:A6:A6:CA:37:
                EF:3B:45:04:02:21:00:EC:27:70:EA:8A:E0:15:B8:0E:
                63:7C:91:76:2F:84:2D:D0:79:61:53:8E:ED:1A:6F:13:
                A9:7E:89:2A:90:1F:90
Signed Certificate Timestamp:
    Version   : v1 (0x0)
    Log ID    : 29:3C:51:96:54:C8:39:65:BA:AA:50:FC:58:07:D4:B7:
                6F:BF:58:7A:29:72:DC:A4:C3:0C:F4:E5:45:47:F4:78
    Timestamp : Feb 18 05:37:15.227 2019 GMT
    Extensions: none
    Signature : ecdsa-with-SHA256
                30:45:02:21:00:F3:57:C2:C2:F3:A4:E5:6B:9B:C0:36:
                54:CC:53:01:6A:05:E4:C9:1C:9B:69:99:06:DD:98:A7:
                F5:C7:48:6C:A4:02:20:5D:19:D0:28:86:FB:0F:1A:61:
                D4:EA:F3:0D:2D:27:69:B4:04:B2:84:DB:B2:DC:20:26:
                F5:3D:A0:46:44:6D:74
        )

)
过期时间:2019-05-19