PHP | XMLReader setParserProperty() Function

The XMLReader::setParserProperty() function is an inbuilt function in PHP which is used to set parser options. This function can be used to validate the document.
Syntax:

bool XMLReader::setParserProperty( int $property, bool $value )

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

$property: It specifies an integer corresponding to one of Parser Option constants as given below:
- XMLReader::LOADDTD (1) This will load DTD but does not validate.
- XMLReader::DEFAULTATTRS (2) This will load DTD and default attributes but does not validate.
- XMLReader::VALIDATE (3) This will load DTD and validate while parsing.
- XMLReader::SUBST_ENTITIES (4) This will substitute entities and expand references.
$value: It specifies whether to enable or disable the property.

Return Value: This function returns TRUE on success or FALSE on failure.
Below examples illustrate the XMLReader::setParserProperty() function in PHP:
Example 1:

data.xml

html

<?xml version="1.0" encoding="utf-8"?>

<div>

    <h1> Sample XML </h1>

</div>

index.php

php

<?php
 
// Create a new XMLReader instance

$XMLReader = new XMLReader();
 
// Open the XML file with sample XML

$XMLReader->open('data.xml');
 
// Set the Parser Property

$XMLReader->setParserProperty(XMLReader::VALIDATE, true);
 
// Check if XMLReader::VALIDATE is set or not

$isProperty = $XMLReader->getParserProperty(XMLReader::VALIDATE);

if ($isProperty) {

    echo 'Property is set.';
}
?>

Output:

Property is set.

Program 2:

data.xml

html

<?xml version="1.0"?>
<!-- DTD rules to be followed by XML-->
<!DOCTYPE html [
<!ELEMENT html (h1, p, heading, body)>
<!ELEMENT h1 (#PCDATA)>
<!ELEMENT p (#PCDATA)>
<!ELEMENT heading (#PCDATA)>
<!ELEMENT body (#PCDATA)>
]>
<!-- XML starts from here -->

<html>

    <h1>Hi</h1>

     

<p>World</p>
 

    <heading>GeeksforGeeks</heading>

  <body>Web Portal for Geeks</body>

</html>

index.php

php

<?php
 
// Create a new XMLReader instance

$XMLReader = new XMLReader();
 
// Open the XML file

$XMLReader->open('data.xml');
 
// Enable the Parser Property

$XMLReader->setParserProperty(XMLReader::VALIDATE, true);
 
// Iterate through the XML nodes

while ($XMLReader->read()) {

    if ($XMLReader->nodeType == XMLREADER::ELEMENT) {
 
        // Check if XML is valid or not

        $isValid = $XMLReader->isValid();

        if ($isValid) {

            echo "YES ! this node is validated<br>";

        }

    }
}
?>

Output:

YES ! this node is validated
YES ! this node is validated
YES ! this node is validated
YES ! this node is validated
YES ! this node is validated

Reference: https://www.php.net/manual/en/xmlreader.setparserproperty.php

Article Tags :

PHP

Web Technologies

PHP-function

PHP-XML