PHP查找过去2天内的文件更改

Question

a couple of days ago (unfortunately) my web site has been hacked. In order to prevent it I'd like to include a PHP which checks if any file has been changed/added in the last 2 days. My starting point is the following function:

function topmods($dir)
{
  $mods = array();
  foreach (glob($dir . '/*') as $f) {
    $mods[] = filemtime($f);
  }
  sort($mods);
  $mods = array_reverse($mods);
  return $mods;
}

I'd like hower to improve it so that only files changed in the last 2 days are included in the array. Any suggestion how to rewrite the foreach function so that you include in the array only files that satisfy this condition?

if (time() - filemtime($testfile) >= 2 * 86400)

Thanks