Php/docs/domattr.isid
DOMAttr::isId
(PHP 5, PHP 7)
DOMAttr::isId — Checks if attribute is a defined ID
Description
public 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.
Return Values
Returns TRUE on success or FALSE on failure.
Examples
Example #1 DOMAttr::isId() Example
<?php$doc = new DomDocument;// We need to validate our document before referring to the id$doc->validateOnParse = true;$doc->Load('book.xml');// We retrieve the attribute named id of the chapter element$attr = $doc->getElementsByTagName('chapter')->item(0)->getAttributeNode('id');var_dump($attr->isId()); // bool(true)?>
