Php preg_更换的问题

这是一个简单的例子：

我有一句话很管用：

$listing['biz_description'] = preg_replace('/<!--.*?--\>/','',$listing['biz_description']);

---

如果你对preg_replace regex感到满意的话，我会解码html实体。。。正如@ircmaxell所提到的，使用正则表达式进行html解析可能非常痛苦

$str = "This is a <!-- test --> of the emergency &lt;!-- broadcast --&gt; system";
$str = preg_replace('/<!--.*?--\>', '' ,html_entity_decode($str));
echo $str;

DomDocument采用有效xml的实现：

$dom = new DomDocument();
$dom->loadXml($listing['biz_description']);
removeComments($dom);
$listing['biz_description'] = $dom->saveXml();

function removeComments(DomNode $node) {
    if ($node instanceof DomComment) {
        $node->parentNode->removeChild($node);
    } else {
        foreach ($node->childNodes as $child) {
            removeComments($child);
        }
    }
}

---

duh，我早就应该想到这个lol了。正则表达式所做的就是解析一个描述字段，这样对服务器来说就不太麻烦了。谢谢

$dom = new DomDocument();
$dom->loadXml($listing['biz_description']);
removeComments($dom);
$listing['biz_description'] = $dom->saveXml();

function removeComments(DomNode $node) {
    if ($node instanceof DomComment) {
        $node->parentNode->removeChild($node);
    } else {
        foreach ($node->childNodes as $child) {
            removeComments($child);
        }
    }
}