/**
 * 删除指定标签
 * @param array  $tags    删除的标签
 * @param string $str     html字符串
 * @param bool   $type    是否保留标签的内容
 * @return mixed
 * @usage
 *  $str = 'Hello</p><p><img src="http://www.baidu.com" /></b><Video>';
 *
 *      // echo strip_tags($str, '<img');
 *      echo $this->stripHtmlTags(array('b','p'),$str,true);
 */
public static function stripHtmlTags($str,$tags=['p','b'], $content=true)
{
    $html = [];
    if($content){
        foreach ($tags as $tag) {
            $html[] = "/(<(?:\/" .$tag. "|" .$tag. ")[^>]*>)/is";
        }
    }else{
        foreach ($tags as $tag) {
            $html[] = '/<' .$tag. '.*?>[\s|\S]*?<\/' .$tag. '>/is';
            $html[] = '/<' .$tag. '.*?>/is';
        }
    }
    $data = preg_replace($html, '', $str);
    return $data;
}