Google Inbox invite checker

checker.php

<?php
$last = '';
while (true) {
  $json = file_get_contents('https://www.reddit.com/r/google/comments/2k0kjr/google_inbox_invite_chain.json?sort=new&foo='.rand(1,500));
  $json = json_decode($json, true);
  $comment = $json[1]['data']['children'][0];

  $msg = $comment['data']['author'] . ' - ' . $comment['data']['body'] . "\n";

  if ($msg != $last) {
    echo "\n" . $msg;
    $last = $msg;
  } else {
    echo '.';
    sleep(1);
  }
}