PHP 5.6.16 is available


(PHP 5)

DOMAttr::isId Checks if attribute is a defined ID


public bool DOMAttr::isId ( void )

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.

Valori restituiti

Restituisce TRUE in caso di successo, FALSE in caso di fallimento.


Example #1 DOMAttr::isId() Example


= new DomDocument;

// We need to validate our document before refering to the id
$doc->validateOnParse true;

// 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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