DOMDocument::getElementById

(PHP 5)

DOMDocument::getElementById — Searches for an element with a certain id

Описание

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.

Список параметров

elementId: The unique id value for an element.

Возвращаемые значения

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

Примеры

Пример #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";

?>

Результат выполнения данного примера:

The element whose id is books is: chapter

Смотрите также

DOMDocument::getElementsByTagName