pixelfed/app/Util/Lexer/PrettyNumber.php

<?php

namespace App\Util\Lexer;

class PrettyNumber {

  public static function convert($expression)
  {
    $abbrevs = array(12 => "T", 9 => "B", 6 => "M", 3 => "K", 0 => "");
      foreach($abbrevs as $exponent => $abbrev) {
          if($expression >= pow(10, $exponent)) {
            $display_num = $expression / pow(10, $exponent);
            $num = number_format($display_num,0) . $abbrev;
            return $num;
          }
      }
      return $expression;
  }

  public static function size($expression, $kb = false)
  {
      if($kb) {
        $expression = $expression * 1024;
      }
      $size = intval($expression);
      $precision = 0;
      $short = true;
      $units = $short ?
          ['B','k','M','G','T','P','E','Z','Y'] :
          ['B','kB','MB','GB','TB','PB','EB','ZB','YB'];
      for($i = 0; ($size / 1024) > 0.9; $i++, $size /= 1024) {}
      $res = round($size, $precision).$units[$i];
      return $res;
  }

}