PHP HTML富文本遇到某些字眼截取

/** * @author      default7<default7> * @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;}</default7>