code: public static function unformatBytes($value)
      {
          if (is_numeric($value)) {
              return $value;
          }
  
          $value_length = strlen($value);
          $qty = (int)substr($value, 0, $value_length - 1);
          $unit = strtolower(substr($value, $value_length - 1));
          switch ($unit) {
              case 'k':
                  $qty *= 1024;
                  break;
              case 'm':
                  $qty *= 1048576;
                  break;
              case 'g':
                  $qty *= 1073741824;
                  break;
          }
  
          return $qty;
      }
docs: Convert a shorthand byte value from a PHP configuration directive to an integer value
  
  @param string $value value to convert
  
  @return int