Вычислить среднее время прочтения текста на PHP

/**
 * Class ReadingTime
 */
class ReadingTime
{
   /**
    * Средняя скорость чтения слов в минуту
    */
   const WORDS_PER_MINUTE = 200;

   const STR_MINUTE = 'мин.';
   const STR_SECOND = 'сек.';

   private $minutes;
   private $seconds;

   /**
    * ReadingTime constructor.
    * @param string $str
    */
   function __construct(string $str)
   {
      $wordCount = $this->wordCount(strip_tags($str));

      $this->minutes = floor($wordCount / static::WORDS_PER_MINUTE);
      $this->seconds = floor($wordCount % static::WORDS_PER_MINUTE / (static::WORDS_PER_MINUTE / 60));
   }

   /**
    * @return string
    */
   public function __toString(): string
   {
      return ($this->minutes == 0)    ? $this->seconds . ' ' . static::STR_MINUTE
         : $this->minutes . ' ' .
         static::STR_MINUTE . ', ' .
         $this->seconds . ' ' .
         static::STR_SECOND;
   }

   /**
    * @return float
    */
   public function getMinutes(): float
   {
      return $this->minutes;
   }

   /**
    * @return float
    */
   public function getSeconds(): float
   {
      return $this->seconds;
   }

   /**
    * @param string $str
    * @return int
    */
   protected function wordCount(string $str): int
   {
      $v = preg_split('/\W+/u', $str, -1, PREG_SPLIT_NO_EMPTY);
      return count($v);
   }
}

ReadingTime Object
(
    [minutes:ReadingTime:private] => 1
    [seconds:ReadingTime:private] => 49
)

Как использовать

$readingTime = new ReadingTime($arResult['DETAIL_TEXT'] ?: $arResult['PREVIEW_TEXT']);
echo $readingTime;

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