php - Reg expression to remove empty Tags (any of them)?

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php - Reg expression to remove empty Tags (any of them)?

posted Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

php - Reg expression to remove empty Tags (any of them)?

I like to remove any empty html tag which is empty or containing spaces.

something like to get:

$string = "<b>text</b><b><span> </span></b><p>  <br/></p><b></b><font size='4'></font>";

to:

$string ="<b>text</b>=;

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1 Reply

深蓝 · Answer 1 · 2021-10-23T19:56:15+0000

Here is an approach with DOM:

// init the document
$dom = new DOMDocument;
$dom->loadHTML($string);

// fetch all the wanted nodes
$xp = new DOMXPath($dom);
foreach($xp->query('//*[not(node()) or normalize-space() = ""]') as $node) {
    $node->parentNode->removeChild($node);
}

// output the cleaned markup
echo $dom->saveXml(
    $dom->getElementsByTagName('body')->item(0)
);

This would output something like

<body><b>text</b></body>

XML documents require a root element, so there is no way to omit that. You can str_replace it though. The above can handle broken HTML.

If you want to selectively remove specific nodes, adjust the XPath query.

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php - Reg expression to remove empty Tags (any of them)?

php - Reg expression to remove empty Tags (any of them)?

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