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<DOMDocument->createTextNode()DOMDocument->getElementsByTagName()>
Last updated: Mon, 16 Jul 2012

DOMDocument->getElementById()

(no version information, might be only in CVS)

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

说明

class DOMDocument {

DOMElement getElementById ( string elementId )

}

This function is similar to DOMDocument->getElementsByTagName() but searches for an element with a given 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.

参数

elementId

The unique id value for an element.

返回值

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

例子 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";

?>

上例将输出:

The element whose id is books is: chapter



<DOMDocument->createTextNode()DOMDocument->getElementsByTagName()>
 Last updated: Mon, 16 Jul 2012
 
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