基于strip_tags
文档,第二个参数采用允许的标记。但在我的情况下,我想反过来。假设我接受script_tags
正常(默认)接受的标记,但只删除<script>
标记。任何可行的方法吗?
我不是指有人为我编写代码,而是非常感谢有关如何实现这一目标的可能方式的输入(如果可能的话)。
答案 0 :(得分:5)
修改强>
要使用HTML Purifier HTML.ForbiddenElements
配置指令,您似乎会执行以下操作:
require_once '/path/to/HTMLPurifier.auto.php';
$config = HTMLPurifier_Config::createDefault();
$config->set('HTML.ForbiddenElements', array('script','style','applet'));
$purifier = new HTMLPurifier($config);
$clean_html = $purifier->purify($dirty_html);
HTML.ForbiddenElements
should be set to an array
。我不知道的是array
成员应采取的形式:
array('script','style','applet')
或者:
array('<script>','<style>','<applet>')
或者......还有别的吗?
我认为这是第一种形式,没有分隔符; HTML.AllowedElements
使用的配置字符串形式与TinyMCE's valid elements
syntax有点相似:
tinyMCE.init({
...
valid_elements : "a[href|target=_blank],strong/b,div[align],br",
...
});
所以我猜这只是一个术语,并且不应该提供任何属性(因为你禁止元素......虽然也有HTML.ForbiddenAttributes
。但这是猜测。
我还会在HTML.ForbiddenAttributes
文档中添加此注释:
警告:此指令补充了
%HTML.ForbiddenElements
, 因此,请查看该指令,以便讨论您的原因 在使用这个指令之前应该三思而行。
黑名单不像白名单那样“强大”,但您可能有自己的理由。请注意并小心。
没有测试,我不知道该告诉你什么。我会继续寻找答案,但我可能会先上床睡觉。现在已经很晚了。 :)
虽然我认为你真的应该使用HTML Purifier并使用它的HTML.ForbiddenElements
配置指令,但我认为如果你真的真的想要使用strip_tags()
,那么合理的选择就是从中导出白名单黑名单。换句话说,删除你不想要的东西,然后使用剩下的东西。
例如:
function blacklistElements($blacklisted = '', &$errors = array()) {
if ((string)$blacklisted == '') {
$errors[] = 'Empty string.';
return array();
}
$html5 = array(
"<menu>","<command>","<summary>","<details>","<meter>","<progress>",
"<output>","<keygen>","<textarea>","<option>","<optgroup>","<datalist>",
"<select>","<button>","<input>","<label>","<legend>","<fieldset>","<form>",
"<th>","<td>","<tr>","<tfoot>","<thead>","<tbody>","<col>","<colgroup>",
"<caption>","<table>","<math>","<svg>","<area>","<map>","<canvas>","<track>",
"<source>","<audio>","<video>","<param>","<object>","<embed>","<iframe>",
"<img>","<del>","<ins>","<wbr>","<br>","<span>","<bdo>","<bdi>","<rp>","<rt>",
"<ruby>","<mark>","<u>","<b>","<i>","<sup>","<sub>","<kbd>","<samp>","<var>",
"<code>","<time>","<data>","<abbr>","<dfn>","<q>","<cite>","<s>","<small>",
"<strong>","<em>","<a>","<div>","<figcaption>","<figure>","<dd>","<dt>",
"<dl>","<li>","<ul>","<ol>","<blockquote>","<pre>","<hr>","<p>","<address>",
"<footer>","<header>","<hgroup>","<aside>","<article>","<nav>","<section>",
"<body>","<noscript>","<script>","<style>","<meta>","<link>","<base>",
"<title>","<head>","<html>"
);
$list = trim(strtolower($blacklisted));
$list = preg_replace('/[^a-z ]/i', '', $list);
$list = '<' . str_replace(' ', '> <', $list) . '>';
$list = array_map('trim', explode(' ', $list));
return array_diff($html5, $list);
}
然后运行它:
$blacklisted = '<html> <bogus> <EM> em li ol';
$whitelist = blacklistElements($blacklisted);
if (count($errors)) {
echo "There were errors.\n";
print_r($errors);
echo "\n";
} else {
// Do strip_tags() ...
}
因此,如果您传入了您不想允许的内容,它会以array
形式返回HTML5元素列表,然后您可以在将其加入strip_tags()
之后将其输入$stripped = strip_tags($html, implode('', $whitelist)));
字符串:
$allowable_tags
警告Emptor
现在,我已经将这种情况整合在一起了,我知道还有一些我还没想过的问题。例如,strip_tags()
man page为strip_tags()
参数:
注意:强>
此参数不应包含空格。
<
看到了一个标签 作为>
与第一个空格或strip_tags("<br/>", "<br>")
之间不区分大小写的字符串。 这意味着$html5
返回一个空字符串。
已经很晚了,出于某种原因,我无法弄清楚这对这种方法意味着什么。所以我明天就要考虑一下。我还在此MDN documentation page函数的<tagName>
元素中编译了HTML元素列表。眼尖的读者可能会注意到所有标签都是这种形式:
{{1}}
我不确定这会对结果产生什么影响,我是否需要考虑使用shorttag <tagName/>
的变化以及某些,ahem, odder变种。当然,还有more tags out there。
所以它可能不是生产准备好了。但是你明白了。
答案 1 :(得分:2)
首先,看看其他人对此主题的看法:
Strip <script> tags and everything in between with PHP?
和
remove script tag from HTML content
看来你有两个选择,一个是正则表达式解决方案,上面的链接都给出了它们。第二种是使用HTML Purifier。
如果由于除用户内容卫生之外的其他原因剥离脚本标记,则正则表达式可能是一个很好的解决方案。但是,正如每个人都警告的那样,如果要清理输入,最好使用HTML Purifier。
答案 2 :(得分:1)
PHP(5或更高版本)解决方案:
如果您要删除<script>
标签(或任何其他标签),也要删除标签内的内容,则应使用:
选项1(最简单):
preg_replace('#<script(.*?)>(.*?)</script>#is', '', $text);
选项2(更多样化):
<?php
$html = "<p>Your HTML code</p><script>With malicious code</script>"
$dom = new DOMDocument();
$dom->loadHTML($html);
$script = $dom->getElementsByTagName('script');
$remove = [];
foreach($script as $item)
{
$item->parentNode->removeChild($item);
}
$html = $dom->saveHTML();
然后$html
将是:
"<p>Your HTML code</p>"
答案 3 :(得分:0)
这是我用来删除禁止标签列表的内容,可以同时删除包含内容的标签和包含内容的标签,还可以删除剩余的空白区域。
$description = trim(preg_replace([
# Strip tags around content
'/\<(.*)doctype(.*)\>/i',
'/\<(.*)html(.*)\>/i',
'/\<(.*)head(.*)\>/i',
'/\<(.*)body(.*)\>/i',
# Strip tags and content inside
'/\<(.*)script(.*)\>(.*)<\/script>/i',
], '', $description));
输入示例:
$description = '<html>
<head>
</head>
<body>
<p>This distinctive Mini Chopper with Desire styling has a powerful wattage and high capacity which makes it a very versatile kitchen accessory. It also comes equipped with a durable glass bowl and lid for easy storage.</p>
<script type="application/javascript">alert('Hello world');</script>
</body>
</html>';
输出结果:
<p>This distinctive Mini Chopper with Desire styling has a powerful wattage and high capacity which makes it a very versatile kitchen accessory. It also comes equipped with a durable glass bowl and lid for easy storage.</p>
答案 4 :(得分:0)
我使用以下内容:
function strip_tags_with_forbidden_tags($input, $forbidden_tags)
{
foreach (explode(',', $forbidden_tags) as $tag) {
$tag = preg_replace(array('/^</', '/>$/'), array('', ''), $tag);
$input = preg_replace(sprintf('/<%s[^>]*>([^<]+)<\/%s>/', $tag, $tag), '$1', $input);
}
return $input;
}
然后你可以这样做:
echo strip_tags_with_forbidden_tags('<cancel>abc</cancel>xpto<p>def></p><g>xyz</g><t>xpto</t>', 'cancel,g');
输出:'abcxpto<p>def></p>xyz<t>xpto</t>'
echo strip_tags_with_forbidden_tags('<cancel>abc</cancel> xpto <p>def></p> <g>xyz</g> <t>xpto</t>', 'cancel,g');
输出:'abc xpto <p>def></p> xyz <t>xpto</t>'