DOMAttr::isId
PHP function
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(PHP 5, PHP 7, PHP 8)
Checks if attribute is a defined ID
Description
DOMAttr::isId(): bool
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.
Parameters Parameters
Return Values
Returns true if this attribute is a defined ID, false otherwise.
Examples
DOMAttr::isId() Example
php
<?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)
?>