Simple SSL web cert check from PHP

check_cert.php

<?php

$urls = json_decode(file_get_contents('sites.json'),true);

function certdata($url) {
  $parseurl = parse_url($url, PHP_URL_HOST);
  $get = stream_context_create(array("ssl" => array("capture_peer_cert" => TRUE)));
  $read = stream_socket_client("ssl://".$parseurl.":443", $errno, $errstr, 30, STREAM_CLIENT_CONNECT, $get);
  $cert = stream_context_get_params($read);
  return openssl_x509_parse($cert['options']['ssl']['peer_certificate']);
}

foreach ($urls as $url) {
  echo $url['url'].':'.PHP_EOL;
  $cd = certdata($url['url']);
  $vleft = (int) (($cd['validTo_time_t']-time())/86400);

  echo "> CN:    ".$cd['subject']['CN'].PHP_EOL;
  echo "> Until: ".date('r',$cd['validTo_time_t']).PHP_EOL;
  echo "> Left:  ".$vleft." days".PHP_EOL;
  echo PHP_EOL;
}

?>

sites.json

[
  {
    "url":"https://listmy.link"
  },
  {
    "url":"https://weinzettel.com.ar"
  },
  {
    "url":"https://telegram.com.ar"
  },
  {
    "url":"https://telegram.ar"
  }
]