php 如何使用标签的 id 去除标签及其所有内部 html？
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How to strip a tag and all of its inner html using the tag's id?
提问by coderama
I have the following html:
我有以下 html：
<html>
<body>
bla bla bla bla
<div id="myDiv">
more text
<div id="anotherDiv">
And even more text
</div>
</div>
bla bla bla
</body>
</html>
I want to remove everything starting from <div id="anotherDiv">until its closing <div>. How do I do that?
我想删除从开始<div id="anotherDiv">到结束的所有内容<div>。我怎么做？
回答by Gordon
With native DOM
使用原生 DOM
$dom = new DOMDocument;
$dom->loadHTML($htmlString);
$xPath = new DOMXPath($dom);
$nodes = $xPath->query('//*[@id="anotherDiv"]');
if($nodes->item(0)) {
$nodes->item(0)->parentNode->removeChild($nodes->item(0));
}
echo $dom->saveHTML();
回答by Haim Evgi
You can use preg_replace()like:
你可以使用preg_replace()像：
$string = preg_replace('/<div id="someid"[^>]+\>/i', "", $string);
回答by RafaSashi
Using the native XML Manipulation Library
使用原生XML 操作库
Assuming that your html content is stored in the variable $html:
假设您的 html 内容存储在变量 $html 中：
$html='<html>
<body>
bla bla bla bla
<div id="myDiv">
more text
<div id="anotherDiv">
And even more text
</div>
</div>
bla bla bla
</body>
</html>';
To delete the tag by ID use the following code:
要按 ID 删除标签，请使用以下代码：
$dom=new DOMDocument;
$dom->validateOnParse = false;
$dom->loadHTML( $html );
// get the tag
$div = $dom->getElementById('anotherDiv');
// delete the tag
if( $div && $div->nodeType==XML_ELEMENT_NODE ){
$div->parentNode->removeChild( $div );
}
echo $dom->saveHTML();
Note that certain versions of libxmlrequire a doctypeto be present in order to use the getElementByIdmethod.
请注意，某些版本libxml需要doctype存在a才能使用该getElementById方法。
In that case you can prepend $html with <!doctype>
在这种情况下，您可以在 $html 前面加上 <!doctype>
$html = '<!doctype>' . $html;
Alternatively, as suggested by Gordon's answer, you can use DOMXPathto find the element using the xpath:
或者，正如戈登的回答所建议的那样，您可以使用DOMXPathxpath 来查找元素：
$dom=new DOMDocument;
$dom->validateOnParse = false;
$dom->loadHTML( $html );
$xp=new DOMXPath( $dom );
$col = $xp->query( '//div[ @id="anotherDiv" ]' );
if( !empty( $col ) ){
foreach( $col as $node ){
$node->parentNode->removeChild( $node );
}
}
echo $dom->saveHTML();
The first method works regardless the tag. If you want to use the second method with the same id but a different tag, let say form, simply replace //divin //div[ @id="anotherDiv" ]by '//form'
无论标签如何，第一种方法都有效。如果您想使用具有相同 id 但不同标签的第二种方法，例如form，只需将//divin替换//div[ @id="anotherDiv" ]为 ' //form'
回答by ItsPronounced
strip_tags() function is what you are looking for.
strip_tags() 函数就是你要找的。
回答by Aram Kocharyan
I wrote these to strip specific tags and attributes. Since they're regex they're not 100% guaranteed to work in all cases, but it was a fair tradeoff for me:
我写这些是为了去除特定的标签和属性。由于它们是正则表达式，因此不能 100% 保证在所有情况下都能正常工作，但这对我来说是一个公平的权衡：
// Strips only the given tags in the given HTML string.
function strip_tags_blacklist($html, $tags) {
foreach ($tags as $tag) {
$regex = '#<\s*' . $tag . '[^>]*>.*?<\s*/\s*'. $tag . '>#msi';
$html = preg_replace($regex, '', $html);
}
return $html;
}
// Strips the given attributes found in the given HTML string.
function strip_attributes($html, $atts) {
foreach ($atts as $att) {
$regex = '#\b' . $att . '\b(\s*=\s*[\'"][^\'"]*[\'"])?(?=[^<]*>)#msi';
$html = preg_replace($regex, '', $html);
}
return $html;
}
回答by Hoàng V? Tgtt
how about this?
这个怎么样？
// Strips only the given tags in the given HTML string.
function strip_tags_blacklist($html, $tags) {
$html = preg_replace('/<'. $tags .'\b[^>]*>(.*?)<\/'. $tags .'>/is', "", $html);
return $html;
}
回答by Jonathan Land
Following RafaSashi's answer using preg_replace(), here's a version that works for a single tag or an array of tags:
按照 RafaSashi 的回答使用preg_replace()，这里有一个适用于单个标签或标签数组的版本：
/**
* @param $str string
* @param $tags string | array
* @return string
*/
function strip_specific_tags ($str, $tags) {
if (!is_array($tags)) { $tags = array($tags); }
foreach ($tags as $tag) {
$_str = preg_replace('/<\/' . $tag . '>/i', '', $str);
if ($_str != $str) {
$str = preg_replace('/<' . $tag . '[^>]*>/i', '', $_str);
}
}
return $str;
}
