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
复制代码 代码如下:
$text = '

Test paragraph.

Other text';
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.

Other text

2.相反，只去掉某一个html标签
复制代码 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 = 'red text';
$tags = 'font';
$a = strip_only($str, $tags); // red text
$b = strip_only($str, $tags, true); // text
?>