readingtime.php

<?php

/**
 * Reading Time
 *
 * A simple plugin that estimates the reading
 * time for any text
 *
 * Sample Usage:
 *
 * <?php echo $page->text()->readingtime() ?>
 *
 * @author Roy Lodder <http://roylodder.com>, Bastian Allgeier <http://getkirby.com>
 * @version 2.1.0
 */
function readingtime($content, $params = array()) {

  $defaults = array(
    'minute'              => 'minute',
    'minutes'             => 'minutes',
    'second'              => 'second',
    'seconds'             => 'seconds',
    'format'              => '{minutesCount} {minutesLabel}, {secondsCount} {secondsLabel}',
    'format.alt'          => '{secondsCount} {secondsLabel}',
    'format.alt.enable'   => false
  );

  $options      = array_merge($defaults, $params);
  $words        = str_word_count(strip_tags($content));
  $minutesCount = floor($words / 200);
  $secondsCount = floor($words % 200 / (200 / 60));
  $minutesLabel = ($minutesCount <= 1) ? $options['minute'] : $options['minutes'];
  $secondsLabel = ($secondsCount <= 1) ? $options['second'] : $options['seconds'];
  $replace      = array(
    'minutesCount' => $minutesCount,
    'minutesLabel' => $minutesLabel,
    'secondsCount' => $secondsCount,
    'secondsLabel' => $secondsLabel,
  );

  if ($minutesCount < 1 and $options['format.alt.enable'] === true ) {
    $result = $options['format.alt'];
  } else {
    $result = $options['format'];
  }

  foreach($replace as $key => $value) {
    $result = str_replace('{' . $key . '}', $value, $result);
  }

  return $result;

}

field::$methods['readingtime'] = function($field, $params = array()) {
  return readingtime($field->value, $params);
};