What will this php code do?

Question

css

I wanted to hang this .php on cron to clear the folder, but I'm afraid that it will delete the wrong one)

<?
  function full_del_dir ($directory)
  {
  $dir = opendir($directory);
  while(($file = readdir($dir)))
  {
    if ( is_file ($directory."/".$file))
    {
      unlink ($directory."/".$file);
    }
    else if ( is_dir ($directory."/".$file) &&
             ($file != ".") && ($file != ".."))
    {
      full_del_dir ($directory."/".$file);  
    }
  }
  closedir ($dir);
  rmdir ($directory);
  echo("Каталог успешно удален");
  }
  full_del_dir ("c:/temp")
?>

Answer 1

Obviously, on the site from which you want to copy the background, there are particles.js that you can put yourself on the link below, where you can configure different background options.
vincentgarreau.com/particles.js

Answer 2

Play around with media queries:

background-size: 50px;
@media (min-width: 1200px) {
  background-size: 100px;
}

Answer 3

Если надо повесить на крон - напишите скрипт. Только будьте очень аккуратны.
rm -rf /path/to/directory