I have well-formed xml documents into string variables. I want to use preg_replace to add a defined attribute to every xml tags.
For example replace:
<tag1>
<tag2> some text </tag2>
</tag1>
by:
<tag1 attr="myAttr">
<tag2 attr="myAttr"> some text </tag2>
</tag1>
So I basically need the regex expression to find any start tags and add my attribute, but I'm a complete regex noob.
Don't use regular expressions for working on xml. Xml is not a regular language. Use the xml extensions of php instead:
$xml = new SimpleXml(file_get_contents($xmlFile));
function process_recursive($xmlNode) {
$xmlNode->addAttribute('attr', 'myAttr');
foreach ($xmlNode->children() as $childNode) {
process_recursive($childNode);
}
}
process_recursive($xml);
echo $xml->asXML();
All answers containing regular expressions will break this valid xml, for example:
<?xml version="1.0" encoding='UTF-8'?>
<html>
<head>
<!-- <meta> ... </meta> -->
<script>//<![CDATA[
function load() {document.write('<tt>Test</tt>');}
//]]></script>
<title><![CDATA[Fancy <<SiteName>> [with Breadcrumbs] > in > title]]></title>
</head>
<body onload="load()">
<input
type="submit"
value="multiline
button
text"
/>
</body>
</html>
$xml_data = preg_replace("/<([^\/]+\w+)/", "<\\1 attr=\"myAttr\">", $xml_data);
OK, for those reading these lines and are still interested about using the regex way for some reasons, here is how to do it:
$xml_data= preg_replace('/(<[A-Za-z0-9\-\_]+[^>]*)>/u','\1 attr="myAttr">',$xmlData);
But, as discussed earlier, use that one with caution! Use it only on XML source that you know won't be broken (see soulmerge post about that)
