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PHP | DOMDocument getElementById() Function
  • Last Updated : 20 Feb, 2020

The DOMDocument::getElementById() function is an inbuilt function in PHP which is used to search for an element with a certain id.

Syntax:

DOMElement DOMDocument::getElementById( string $elementId )

Parameters:This function accepts a single parameter $elementId which holds the id to search for.

Return Value: This function returns the DOMElement or NULL if the element is not found.

Below given programs illustrate the DOMDocument::getElementById() function in PHP:



Program 1: In this program we will get the tagname of element with certain id.

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<?php
  
// Create a new DOM Document
$dom = new DOMDocument('1.0', 'iso-8859-1');
  
// Enable validate on parse
$dom->validateOnParse = true;
  
// Create a div element
$element = $dom->appendChild(new DOMElement('div'));
  
// Create a id attribute to div
$attr = $element->setAttributeNode(
        new DOMAttr('id', 'my_id'));
  
// Set that attribute as id
$element->setIDAttribute('id', true);
  
// Get the tag name
$tagname = $dom->getElementById('my_id')->tagName;
  
echo $tagname;
?>

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Output:

div // Because id 'my_id' is applied to div tag.

Program 2: In this program we will get the content of element with certain id.

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<?php
  
// Create a new DOM Document
$dom = new DOMDocument('1.0', 'iso-8859-1');
  
// Enable validate on parse
$dom->validateOnParse = true;
  
// Create a div element
$element = $dom->appendChild(new DOMElement('div',
   'Hey, this is the text content of the div element.'));
  
// Create a id attribute to div
$attr = $element->setAttributeNode(
          new DOMAttr('id', 'my_id'));
  
// Set that attribute as id
$element->setIDAttribute('id', true);
  
// Get the tag content
$tagcontent = $dom->getElementById('my_id')->textContent;
  
echo $tagcontent;
?>

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Output:

Hey, this is the text content of the div element.

Reference: https://www.php.net/manual/en/domdocument.getelementbyid.php

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