PHP | XMLReader setRelaxNGSchema() Function

The XMLReader::setRelaxNGSchema() function is an inbuilt function in PHP which is used to set the filename or URI for the RelaxNG Schema to use for validation.

Syntax:

bool XMLReader::setRelaxNGSchema( string $filename )

Parameters: This function accepts a single parameter $filename which holds the filename or URI pointing to a RelaxNG Schema.

Return Value: This function returns TRUE on success or FALSE on failure.

Below examples illustrate the XMLReader::setRelaxNGSchema() function in PHP:



    Example 1:

  • data.xml ( The XML file to be validated )
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    <?xml version="1.0"?>
    <body>
        <div>
            <h1>Heading 1</h1>
            <h2>Heading 2</h2>
        </div>
        <div>
            <h1>Heading 3</h1>
            <h2>Heading 4</h2>
        </div>
    </body>

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  • rule.rng ( The rules to be followed by the XML file )
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    <element name="body" 
      <zeroOrMore>
        <element name="div">
          <element name="h1">
            <text/>
          </element>
          <element name="h2">
            <text/>
          </element>
        </element>
      </zeroOrMore>
    </element>

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  • index.php ( PHP script to run the validator )
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    <?php
      
    // Create a new XMLReader instance
    $XMLReader = new XMLReader();
      
    // Open the XML file
    $XMLReader->open('data.xml');
      
    // Load the rule file
    $XMLReader->setRelaxNGSchema('rule.rng');
      
    // Iterate through the XML nodes
    // and validate each node
    while ($XMLReader->read()) {
        if ($XMLReader->nodeType == XMLREADER::ELEMENT) {
      
            // Check if XML follows the relaxNG rule
            if ($XMLReader->isValid()) {
                echo "This document is valid!<br>";
            }
      
        }
    }
    ?>

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  • Output:
    This document is valid!
    This document is valid!
    This document is valid!
    This document is valid!
    This document is valid!
    This document is valid!
    This document is valid!

Program 2:

  • data.xml
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    <?xml version="1.0"?>
    <body>
        <div>
            <!--Remove Heading 1
              to violate rule-->
            <h2>Heading 2</h2>
        </div>
        <div>
            <h1>Heading 3</h1>
            <h2>Heading 4</h2>
        </div>
    </body>

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  • rule.rng
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    <element name="body"
      <zeroOrMore>
        <element name="div">
          <element name="h1">
            <text/>
          </element>
          <element name="h2">
            <text/>
          </element>
        </element>
      </zeroOrMore>
    </element>

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  • index.php
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    <?php
      
    // Create a new XMLReader instance
    $XMLReader = new XMLReader();
      
    // Open the XML file
    $XMLReader->open('data.xml');
      
    // Load the rule file
    $XMLReader->setRelaxNGSchema('rule.rng');
      
    // Iterate through the XML nodes
    while ($XMLReader->read()) {
        if ($XMLReader->nodeType == XMLREADER::ELEMENT) {
      
            // Check if XML follows the relaxNG rule
            if (!$XMLReader->isValid()) {
                echo "This document is not valid!<br>";
            }
      
        }
    }
    ?>

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  • Output:
    This document is not valid!
    This document is not valid!
    This document is not valid!
    This document is not valid!

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




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