Замена части контента

<?php
$end = '<div class="clear"> </div>';
$ress = $modx->getCollection('modResource', array('parent' => 43, 'content:LIKE' => '%'.$end.'%'));
$arIds = array();
foreach ($ress as $res) {
    $arIds[] = $res->id;
}
$ress = $modx->getCollection('modResource', array('parent' => 43, 'content:LIKE' => '%div class="slider_lynx%', 'id:IN' => $arIds));
// print count($ress);
foreach ($ress as $res) {
    // print '<a href="http://ezois.nermolrx.bget.ru/manager/?a=resource/update&id=' . $res->id . '" target="_blank">' . $res->pagetitle . '</a>';
    // print "<br>";
    
    
    
    $start = strpos($res->content, '<div class="slider_lynx');
    $end = strpos($res->content, '<div class="clear"> </div>');
    $content = substr($res->content, $start, $end + 37 - $start);
    $res->content = str_replace($content, '[[$promo_content_slider]]', $res->content);
    // print $res->content;
    $res->save();
    // $arContent = explode('upload/', $content);
    // $arSrc = array();
    // foreach ($arContent as $index => $img) {
    //     if ($index === 0) continue;
    //     $end_img = strpos($img, '"');
    //     $src = 'upload/' . substr($img, 0, $end_img);
    //     $arSrc[] = array('MIGX_id' => $index, 'image' => $src);
    // }
    // $res->setTVValue('migx_content_slider', json_encode($arSrc));
    // print "\n\n\n\n\n\n====================================\n\n\n\n\n";
    // break;
}