PHP HTML富文本遇到某些字眼截取

/**
 * @author      default7<default7@zbphp.com>
 * @description 裁剪HTML，当他遇到某段文字的时候
 *
 * @param        $htmlContent
 * @param string $meetStr
 *
 * @return string
 */
function cutHtmlWhenMeet($htmlContent, $meetStr = "")
{
    if (!empty($meetStr)) {
        $posMeet = mb_strpos($htmlContent, $meetStr, null, "UTF-8");
        if ($posMeet !== false) {
            $htmlEnd = mb_substr($htmlContent, 0, $posMeet, "UTF-8");
            $posEnd = mb_strrpos($htmlEnd, "</", null, "UTF-8") + 3;
            while (true) {
                $posEnd++;
                $tmp = mb_substr($htmlEnd, $posEnd, null, "UTF-8");
                if (!trim(strip_tags($tmp)) || $posEnd >= $posMeet) {
                    break;
                }
            }

            $htmlContent = mb_substr($htmlContent, 0, $posEnd, "UTF-8");
        }
    }

    return $htmlContent;
}