Monitor a file for changes and notifies via slack when its changed.

monitor.php

<?php 
$changed = false;
$hash = "5718fb07bde7a1c585c533d1b720cf8b";
$filename = "index.php";

while(true) {
  $current_hash = md5(file_get_contents($filename));

  if($current_hash != $hash) {
          if($changed == false) {
              echo time() . "hacked\n";
              shell_exec("curl -X POST --data-urlencode \"payload={'channel': '#nmon', 'username': 'newfilebot', 'text': '$filename changed  `tail /var/logs/apache2/access.log`', 'icon_emoji': ':ghost:'}\" https://hooks.slack.com/services/xxx/xxx/xxxx");
          }
          $changed = true;
  } else {
          if($changed == true) { echo "restored\n"; }
          $changed = false;
  }

  sleep(1);
}