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PHP | DOMNode C14N() Function
  • Last Updated : 26 Feb, 2020

The DOMNode::C14N() function is an inbuilt function in PHP which is used to convert a node into string.

Syntax:

string DOMNode::C14N( bool $exclusive, 
bool $with_comments, array $xpath, array $ns_prefixes )

Parameters: This function accepts four parameters as mentioned above and described below:

  • $exclusive (Optional): It specifies whether to enable exclusive parsing of only the nodes matched by the provided xpath or namespace prefixes.
  • $with_comments (Optional): It specifies whether to retain comments in output.
  • $xpath (Optional): It specifies an array of xpaths to filter the nodes by.
  • $ns_prefixes (Optional): It specifies an array of namespace prefixes to filter the nodes by.

Return Value: This function returns canonicalized nodes as a string or FALSE on failure.

Below examples illustrate the DOMNode::C14N() function in PHP:



Example 1:

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<?php
  
// Create a DOMDocument
$doc = new DOMDocument();
  
// Load XML
$doc->loadXML('<html></html>');
  
// Create an heading element on 
// DOMDocument object
$h1 = $doc->createElement('h1');
  
// Append the child
$doc->documentElement->appendChild($h1);
  
// Get the data without comments
$stringdata = $doc->C14N();
echo $stringdata;
?>

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Output:

<html><h1></h1></html>

Example 2:

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<?php
// Create a DOMDocument
$doc = new DOMDocument();
  
// Load XML
$doc->loadXML('<html><!-- This is a comment --></html>');
  
// Create an heading element on DOMDocument object
$h1 = $doc->createElement('h1');
  
// Append the child
$doc->documentElement->appendChild($h1);
  
// Get the data with comments
$stringdata = $doc->C14N(false, true);
echo 'With Comments: <br>';
echo htmlentities($stringdata);
  
// Get the data without comments
$stringdata = $doc->C14N(false, false);
echo '<br>Without Comments: <br>';
echo htmlentities($stringdata);
?>

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Output:

With Comments: 
<html><!-- This is a comment --><h1></h1></html>
Without Comments:
<html><h1></h1></html>

Reference: https://www.php.net/manual/en/domnode.c14n.php

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