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PHP | DOMDocument getElementById() Function

Last Updated : 20 Feb, 2020
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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.
<?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;
?>
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.
<?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;
?>
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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