PHP将字符串转换为htmlentities [英] PHP convert string to htmlentities

问题描述

如何将<code>和<pre>标记内的代码转换为html实体?

How can I convert the code inside the <code> and <pre> tags to html entities ?

<code class="php"> <div> a div.. </div> </code>

<pre class="php">
<div> a div.. </div>
</pre>

<div> this should be ignored </div>

推荐答案

好的，我已经玩了一段时间了.结果可能不是最好或最直接的解决方案(坦率地说，如果有任意用户要提交输入，我完全不同意您的方法)，但它似乎有效".而且，最重要的是，它不使用正则表达式来解析XML. :)

OK, I've been playing with this for a while. The result may not be the best or most direct solution (and, frankly, I disagree with your approach entirely if arbitrary users are going to be submitting the input), but it appears to "work". And, most importantly, it doesn't use regexes for parsing XML. :)

使输入无效

<?php

$str = <<<EOF
<code class="php"> <div> a div.. </div> </code>

<pre class="php">
<div> a div.. </div>
</pre>

<div> this should be ignored </div>
EOF;

?>

代码

<?php

function recurse(&$doc, &$parent) {
   if (!$parent->hasChildNodes())
      return;

   foreach ($parent->childNodes as $elm) {

      if ($elm->nodeName == "code" || $elm->nodeName == "pre") {
         $content = '';
         while ($elm->hasChildNodes()) { // `for` breaks the `removeChild`
             $child = $elm->childNodes->item(0);
             $content .= $doc->saveXML($child);
             $elm->removeChild($child);
         }
         $elm->appendChild($doc->createTextNode($content));
      }
      else {
         recurse($doc, $elm);
      }
   }
}

// Load in the DOM (remembering that XML requires one root node)
$doc = new DOMDocument();
$doc->loadXML("<document>" . $str . "</document>");

// Iterate the DOM, finding <code /> and <pre /> tags:
recurse($doc, $doc->documentElement);

// Output the result
foreach ($doc->childNodes->item(0)->childNodes as $node) {
   echo $doc->saveXML($node);
}

?>

输出

<code class="php"> &lt;div&gt; a div.. &lt;/div&gt; </code>

<pre class="php">
&lt;div&gt; a div.. &lt;/div&gt;
</pre>

<div> this should be ignored </div>

证明

您可以在此处看到它.

请注意，它不会显式调用htmlspecialchars； DOMDocument对象可以自行处理转义.

Note that it doesn't explicitly call htmlspecialchars; the DOMDocument object handles the escaping itself.

我希望这会有所帮助. :)

I hope that this helps. :)

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