PHP Dokumentation: Domdocument getelementbyid
12. Januar 2010 von werner
DOMDocument::getElementById
(PHP 5)
DOMDocument::getElementById — Searches for an element with a certain id
Beschreibung
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
Beispiel #1 DOMDocument->getElementById() Example
<?php$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 folgendeAusgabe:
The element whose id is books is: chapter
Siehe auch
- DOMDocument::getElementsByTagName – Searches for all elements with given tag name
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