php正则过滤指定html标签示例

/**

* @param $content
* @return mixed
* 过滤a标签保留内容
*/
public function delete_tags_a($content){
$content = preg_replace("#]*>(.*?)#is", "$1", $content);
return $content;
}

/**
* @param $content
* @param string $tag 传入要删除的标签
* @param bool $ident true 保留标签内容,false不保留标签内容
* @return mixed
*/
public function delete_tags($content,$tag='a',$ident=true){
if($ident){
$content = preg_replace("#]*>(.*?){$tag}>#is", "$1", $content);
}else{
$content = preg_replace("/([＼s＼S]*?)/",'',$content);
}
return $content;
}

/**
* @param $str
* @return mixed|string
* 过滤所有html标签
*/
public function deletehtml($str)
{
$str = trim($str);
$str=strip_tags($str,"");
$str=preg_replace("{＼t}","",$str);
$str=preg_replace("{＼r＼n}","",$str);
$str=preg_replace("{＼r}","",$str);
$str=preg_replace("{＼n}","",$str);
$str=preg_replace("{ }","",$str);
$str=preg_replace("{ }","",$str);
return $str;
}