Adjust copyrights years

<?php
/**
 * SeekQuarry/Yioop --
 * Open Source Pure PHP Search Engine, Crawler, and Indexer
 *
 * Copyright (C) 2009 - 2018  Chris Pollett chris@pollett.org
 *
 * LICENSE:
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * END LICENSE
 *
 * @author Chris Pollett chris@pollett.org
 * @license https://www.gnu.org/licenses/ GPL3
 * @link https://www.seekquarry.com/
 * @copyright 2009 - 2018
 * @filesource
 */
namespace seekquarry\yioop\views\helpers;

/**
 * Helper used to draw thumbnails for video sites
 *
 * @author Chris Pollett
 */
class VideourlHelper extends Helper
{
    /**
     * Used to check if a url is the url of a video site and if so
     * draw a link with a thumbnail from the video.
     * @param string $url to check if of a video site
     * @param array $video_sources video sites url info to check $url against
     * @param boolean $open_in_tabs whether new links should be opened in
     *    tabs
     */
    public function render($url, $video_sources, $open_in_tabs = false)
    {
        if (strncmp($url, "url", 3) == 0) {
            $link_url_parts = explode("|", $url);
            if (count($link_url_parts) > 1) {
                $url = htmlentities($link_url_parts[1]);
            }
        } else {
            $url = htmlentities($url);
        }
        foreach ($video_sources as $source) {
            $url_expression = $source['SOURCE_URL'];
            $expression_parts = explode("{}", $url_expression);
            $found_id = false;
            if (stripos($url, $expression_parts[0]) !== false) {
                $id = substr($url, strlen($expression_parts[0]));
                $len = 0;
                if (isset($expression_parts[1]) &&
                    ($len = strlen($expression_parts[1])) > 0) {
                    if (($pos = stripos($id, $expression_parts[1])) > 0) {
                        $id = substr($id, 0, $pos);
                        $found_id = true;
                    }
                } else if ($len == 0) {
                    $found_id = true;
                }
            }
            if ($found_id) {
                $thumb_expression = $source['AUX_INFO'];
                $thumb_parts = explode("{}", $thumb_expression);
                $thumb_url = $thumb_parts[0] . $id;
                if (isset($thumb_parts[1])) {
                    $thumb_url .= $thumb_parts[1];
                }
                ?><a class="video-link" href="<?= $url ?>" <?php
                if ($open_in_tabs) { ?>
                    target="_blank" rel="noopener"<?php
                }?>><img
                class="thumb" src="<?= $thumb_url  ?>"
                alt="Thumbnail for <?= $id ?>" />
                <img class="video-play" src="resources/play.png" alt="" />
                </a>
                <?php
            }
        }
    }
}