DOM
PHP Manual

DOMDocument->getElementById()

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DOMDocument->getElementById() — Searches for an element with a certain id

Descripción

DOMDocument
DOMElement 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.

Lista de parámetros

elementId

The unique id value for an element.

Valores retornados

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

Ejemplos

Example#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";

?>

El resultado del ejemplo seria:

The element whose id is books is: chapter

Ver también


DOM
PHP Manual