How to Remove a Specific Child Element with a Given Attribute in SimpleXML Using PHP?

Removing Specific Children with Attributes Using PHP's SimpleXML

In SimpleXML, directly removing child elements using unset() may not be effective. To eliminate a specific child with a particular attribute (e.g., an element with an id of "A12"), consider employing the DOM extension.

Solution Using DOM

1. Import the SimpleXMLElement into a DOMElement using dom_import_simplexml().
2. Use $dom->parentNode->removeChild($dom) to delete the child element from its parent.

Example Code

$data = '<data><seg></seg></data>

Output

<?xml version="1.0"?>
<data><seg></seg></data>

XPath Alternative

Alternatively, simplify node selection using XPath, as illustrated in the following code:

$segs = $doc->xpath('//seq[@id="A12"]');
if (count($segs) >= 1) {
    $seg = $segs[0];
}

// Removal procedure as described above

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