PHP | DOMDocument schemaValidate() Function

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

  
  

  
  
  

  <?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    // 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

  
  

  
  
  

  <?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    // 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