PHP | DOMDocument schemaValidate() Function

Last Updated : 20 Feb, 2020
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The DOMDocument::schemaValidate() function is an inbuilt function in PHP which is used to validate a document based on the given schema file. The schema file can be in an XSD format which is the recommendation from W3C (World Wide Web Consortium). Syntax: 
bool DOMDocument::schemaValidate( string $filename, int $flags = 0 )
Parameters: This function accept two parameters as mentioned above and described below:
  • $filename: It specifies the path to the schema.
  • $flags (Optional): It specifies the validation flags.
Return Value: This function returns TRUE on success or False on failure. Below given programs illustrate the DOMDocument::schemaValidate() function in PHP: Program 1:
  • File name: rule.xsd php 
    <?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified">
    <xs:element name="student">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="name" type="xs:string"/>
                <xs:element name="rollno" type="xs:integer"/>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>
  • File name: index.php php 
    <?php

// Create a new DOMDocument
$doc = new DOMDocument;

// Load the XML
$doc->loadXML("<?xml version=\"1.0\"?>
<student>
    <name>Rahul </name>
    <rollno>34</rollno>
</student>");

// Check if XML follows the rule
if ($doc->schemaValidate('rule.xsd')) {
    echo "This document is valid!\n";
}
?>
  • Output: 
    This document is valid!
Program 2:
  • File name: rule.xsd php 
    <?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified">
    <xs:element name="body">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="h1" type="xs:string"/>
                <xs:element name="strong" type="xs:integer"/>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>
  • File name: index.php php 
    <?php

// Create a new DOMDocument
$doc = new DOMDocument;

// Load the XML
$doc->loadXML("<?xml version=\"1.0\"?>
<student>
    <h1>Rahul </h1>
</student>");

// Check if XML follows the rule
if (!$doc->schemaValidate('rule.xsd')) {
    echo "This document is not valid!\n";
}
?>
  • Output: 
    This document is not valid!
Reference: https://www.php.net/manual/en/domdocument.schemavalidate.php

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