PHP | DOMDocument schemaValidate() Function

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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

<?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"; 
} 
?> 