Please wait while we load your page...

PasswordSentry

Latest Version [8.00202205221] Last Updated [May-22-2022]

Tools

PHP Manual [DOMDocument

Protect Your Website Today


PHP Manual || DOMDocument

(PHP 5, PHP 7)

DOMDocument::getElementByIdSearches for an element with a certain id

Description

public DOMDocument::getElementById ( string $elementId ) : DOMElement

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.

Parameters

elementId

The unique id value for an element.

Return Values

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

Examples

Example #1 DOMDocument::getElementById() Example

The following examples use book.xml which contains the following:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE books [
  <!ELEMENT books   (book+)>
  <!ELEMENT book    (title, author+, xhtml:blurb?)>
  <!ELEMENT title   (#PCDATA)>
  <!ELEMENT blurb   (#PCDATA)>
  <!ELEMENT author  (#PCDATA)>
  <!ATTLIST books   xmlns        CDATA  #IMPLIED>
  <!ATTLIST books   xmlns:xhtml  CDATA  #IMPLIED>
  <!ATTLIST book    id           ID     #IMPLIED>
  <!ATTLIST author  email        CDATA  #IMPLIED>
]>
<?xml-stylesheet type="text/xsl" href="style.xsl"?>
<books xmlns="http://books.php/" xmlns:xhtml="http://www.w3.org/1999/xhtml">
  <book id="php-basics">
    <title>PHP Basics</title>
    <author email="[email protected]">Jim Smith</author>
    <author email="[email protected]">Jane Smith</author>
    <xhtml:blurb><![CDATA[
<p><em>PHP Basics</em> provides an introduction to PHP.</p>
]]></xhtml:blurb>
  </book>
  <book id="php-advanced">
    <title>PHP Advanced Programming</title>
    <author email="[email protected]">Jon Doe</author>
  </book>
</books>


PHP Manual || DOMDocument