PHP | DOMCharacterData replaceData() Function

The DOMCharacterData::replaceData() function is an inbuilt function in PHP which is used to replace a substring within the DOMCharacterData node.

Syntax:

void DOMCharacterData::replaceData( int $offset, int $count, string $data)

Parameters: This function accept three parameters as mentioned above and described below:

• $offset: It specifies the starting position to delete the data.
• $count: It specifies the number of characters to delete.
• $data: It specifies the string with which the range must be replaced.

Return Value: This function does not return any value.

Exceptions: DOM_INDEX_SIZE_ERR is raised if $offset is negative or greater than the number of 16-bit units in data, or if $count is negative.

Below given programs illustrate the DOMCharacterData::replaceData() function in PHP:

Program 1 (Replacing Data from beginning):

<?php

// Create a new DOM Document
$dom = new DOMDocument('1.0', 'iso-8859-1');

// Create a div element
$element = $dom->appendChild(new DOMElement('div'));

// Create a DOMCdataSection
$text = $element->appendChild(
        new DOMCdataSection('My DOM Characters'));

// Replace the data
$text->replaceData(0, 2, 'My Replaced');

echo $dom->saveXML();
?>

Output:

<?xml version="1.0" encoding="iso-8859-1"?>
<div><![CDATA[My Replaced DOM Characters]]></div>

Use Chrome Developer tools to view the HTML or press Ctrl+U

Program 2 (Replacing Data in the middle):

<?php

// Create a new DOM Document
$dom = new DOMDocument('1.0', 'iso-8859-1');

// Create a div element
$element = $dom->appendChild(new DOMElement('div'));

// Create a DOMCdataSection
$text = $element->appendChild(
        new DOMCdataSection('GeeksErrorGeeks'));

// Replace Data
$text->replaceData(5, 5, 'For');

echo $dom->saveXML();
?>

Output:

<?xml version="1.0" encoding="iso-8859-1"?>
<div><![CDATA[GeeksForGeeks]]></div>

Reference: https://www.php.net/manual/en/domcharacterdata.replacedata.php