将htmlentities应用于剥离的标签 [英] Apply htmlentities to stripped tags

问题描述

研究链接:

如何选择性地应用htmlentities? 和 使用PHP函数剥离标签，除了列入白名单的标签和属性列表

它们很接近，但没有达到预期.

They are close but not as expected.

我尝试了什么?

<?php
define('CHARSET', 'UTF-8');
define('REPLACE_FLAGS', ENT_HTML5);

function htmlcleaned($string) {
    $string = htmlentities($string);
    return str_replace(
    array("&lt;i&gt;", "&lt;b&gt;", "&lt;/i&gt;", "&lt;/b&gt;", "&lt;p&gt;", "&lt;/p&gt;"),
    array("<i>", "<b>", "</i>", "</b>", "<p>", "</p>"), $string);
}

echo htmlcleaned("<p>How are you?</p><p><b>This is bold</b></p><p><i>This is italic</i></p><p><u>This is underline</u></p><p><br></p><ul><li>This is list item 1</li><li>This is list item 2</li></ul><p><br></p><ol><li>This is ordered list item 1</li><li>This is ordered list item 2</li></ol><p><a target='_blank' style='color: #1c5c76;' href='http://www.google.com'>http://www.google.com</a></p><p>This is plain text again.<br></p><script>alert('attempt csrf');</script><p><p>This is P tag example</p></p>");
?>

我想实现什么?

如果输入是:

<b><script>alert("something");</script></b>

然后输出将是:

<b>&lt;script&rt;("something");&lt;/script$rt;</b>

没有特定的黑名单，但有特定的白名单.

There is no specific blacklist but there is a specific white list.

推荐答案

此功能可能对您有帮助，但尚未经过严格测试.它将对除您指定的标签之外的所有标签执行htmlentity

This function might help you, it is not highly tested. It will do htmlentities on all the tags except the tags you specify

function html_entity_decode_matches($matches){
    return html_entity_decode($matches[0]); 
}
function htmlentities_exclude($string, $exclude_array){
    $string = htmlentities($string); //htmlentities all
    $ent_sl = ">"; //>
    if (is_array($exclude_array) AND !empty($exclude_array)){
        foreach($exclude_array as $exc){
            $exc = str_replace(array("<", ">"), "", $exc);
            $ent = str_replace("/", "\/", htmlentities("<{$exc}"));
            $ent_e = str_replace("/", "\/", htmlentities("</{$exc}>"));
            //do decode on <tag...>
            $string = preg_replace_callback("/{$ent}(.*?){$ent_sl}/", "html_entity_decode_matches", $string);
            //do decode on <\tag>
            $string = preg_replace_callback("/{$ent_e}/", "html_entity_decode_matches", $string);
        }
    }
    return $string;
}

---

echo htmlentities_exclude('<b><script>alert("something");</script></b>', array("<b>"));

Output:
<b>&lt;script&gt;alert(&quot;something&quot;);&lt;/script&gt;</b>

这篇关于将htmlentities应用于剥离的标签的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！