<?php
  function timesince($time) {
    $time = time() - $time;
    $timeunits = [
      31536000 => 'year',
      2592000 => 'month',
      604800 => 'week',
      86400 => 'day',
      3600 => 'hour',
      60 => 'minute',
    ];

    foreach ($timeunits as $unit => $text) {
      if ($time < $unit)
        continue;
      $numunits = floor($time / $unit);
      return ' '.$numunits.' '.$text.(($numunits > 1) ? 's' : '');
    }
  }

  function humanfilesize($size, $unit="") {
    if ((!$unit && $size >= 1 << 30) || $unit == "GB")
      return number_format($size / (1 << 30),2)."GB";
    if ((!$unit && $size >= 1 << 20) || $unit == "MB")
      return number_format($size / (1 << 20),2)."MB";
    if ((!$unit && $size >= 1 << 10) || $unit == "KB")
      return number_format($size / (1 << 10),2)."KB";
    return number_format($size)." bytes";
  }

  function toupperpurity($str) {
    if ($str == "sfw")
      return strtoupper($str);
    if ($str == "sketchy")
      return ucfirst($str);
    if ($str == "nsfw")
      return strtoupper($str);
    return $str;
  }
?>