php 批量替换html标签的实例代码

1.把html元素全部去掉，或者保留某几个html标签

代码如下:

$text = '

Test paragraph.

';
echo strip_tags($text);
echo "/n";

// Allow

and
echo strip_tags($text,'

');
?>

结果为(去掉了注释)：

Test paragraph. Other text

Test paragraph.

2.相反，只去掉某一个html标签

代码如下:

function strip_only($str,$tags,$stripContent = false) {
$content = '';
if(!is_array($tags)) {
$tags = (strpos($str,'>') !== false ? explode('>',str_replace('<','',$tags)) : array($tags));
if(end($tags) == '') array_pop($tags);
}
foreach($tags as $tag) {
if ($stripContent)
$content = '(.+]*>|)';
$str = preg_replace('#]*>'.$content.'#is',$str);
}
return $str;
}

$str = ' text';
$tags = 'font';
$a = strip_only($str,$tags); // red text
$b = strip_only($str,true); // text
?>