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@ 2017-04-13T19:00:20Z

<?php
#ここでドメイン名を指定
$domain_name = 'yahoo.co.jp';
#外部接続するために必要なストリームコンテキストを取得する(ここでアロー演算子でSSL証明書の情報を絞り混んでます)
$stream_context = stream_context_create(array(
  'ssl' => array('capture_peer_cert' => true)
));
#stream_socket_client関数で外物接続。$errno は接続失敗時のシステムエラーのレベルが
#$errstrは接続失敗した時のエラーメッセージが入ります 5　と書いてあるところはタイムアウトまでの時間です
$resource = stream_socket_client(
  'ssl://' . $domain_name . ':443',$errno,$errstr,5,STREAM_CLIENT_CONNECT,$stream_context
);
#帰ってきた情報からstream_context_get_paramsで選んだドメインの情報を配列で取得します
$cont = stream_context_get_params($resource);
#上記で撮ってきた配列から配列からpeer_certificateという場所から idを取得してそれから全情報を取得する。
$parsed = openssl_x509_parse($cont['options']['ssl']['peer_certificate']);
#あとは全情報から配列を抜き出して絞り込んで好きな形式に期限を出す
if(strpos($parsed['subject']['CN'], $domain_name) !== false){
  echo date('Y/m/d', $parsed['validTo_time_t']);
}else{
  echo 'not contract.'; 
}

Output for git.master, git.master_jit: Warning: stream_socket_client(): Unable to connect to ssl://yahoo.co.jp:443 (Unable to find the socket transport "ssl" - did you forget to enable it when you configured PHP?) in /in/9au6Z on line 10 Fatal error: Uncaught TypeError: stream_context_get_params(): Argument #1 ($context) must be of type resource, bool given in /in/9au6Z:14 Stack trace: #0 /in/9au6Z(14): stream_context_get_params(false) #1 {main} thrown in /in/9au6Z on line 14
Process exited with code 255.
Output for rfc.property-hooks: Warning: stream_socket_client(): Unable to connect to ssl://yahoo.co.jp:443 (Unable to find the socket transport "ssl" - did you forget to enable it when you configured PHP?) in /in/9au6Z on line 10 Fatal error: Uncaught TypeError: stream_context_get_params(): Argument #1 ($context) must be of type resource, false given in /in/9au6Z:14 Stack trace: #0 /in/9au6Z(14): stream_context_get_params(false) #1 {main} thrown in /in/9au6Z on line 14
Process exited with code 255.

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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