(PHP 5, PHP 7, PHP 8)
DOMAttr::isId — Checks if attribute is a defined ID
This function checks if the attribute is a defined ID.
According to the DOM standard this requires a DTD which defines the attribute ID to be of type ID. You need to validate your document with DOMDocument::validate or DOMDocument::$validateOnParse before using this function.
This function has no parameters.
Example #1 DOMAttr::isId() Example
<?php
$doc = new DOMDocument;
/ We need to validate our document before referring to the id
$doc->validateOnParse = true;
$doc->load('examples/book-docbook.xml');
/ We retrieve the attribute named id of the chapter element
$attr = $doc->getElementsByTagName('chapter')->item(0)->getAttributeNode('id');
var_dump($attr->isId()); / bool(true)
?>
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