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DOMDocument::getElementById


(PHP 5)

DOMDocument::getElementByIdSearches for an element with a certain id

Beschreibung

DOMElement DOMDocument::getElementById ( string $elementId )

This function is similar to DOMDocument::getElementsByTagName but searches for an element with a given id.

For this function to work, you will need either to set some ID attributes with DOMElement::setIdAttribute or a DTD which defines an attribute to be of type ID. In the later case, you will need to validate your document with DOMDocument::validate or DOMDocument->validateOnParse before using this function.

Parameter-Liste

elementId

The unique id value for an element.

Rückgabewerte

Returns the DOMElement or NULL if the element is not found.

Beispiele

PHP Code
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$doc = new DomDocument; // We need to validate our document before refering to the id $doc->validateOnParse = true; $doc->Load('book.xml'); echo "The element whose id is books is: " . $doc->getElementById('books')->tagName . "\n";

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

The element whose id is books is: chapter

Siehe auch