DOMDocument::schemaValidateSource
DOMDocument::xinclude
DOMDocument
PHP Manual

# DOMDocument::validate

(PHP 5, PHP 7)

DOMDocument::validate — Validates the document based on its DTD

### Description

public bool DOMDocument::validate ( void )

Validates the document based on its DTD.

You can also use the validateOnParse property of DOMDocument to make a DTD validation.

### Return Values

Returns `TRUE` on success or `FALSE` on failure. If the document have no DTD attached, this method will return `FALSE`.

### Examples

Example #1 Example of DTD validation

`<?php
$dom = new DOMDocument;
$dom->Load('book.xml');
if ($dom->validate()) {
echo "This document is valid!\n";
}
?>`

You can also validate your XML file while loading it:

`<?php
$dom = new DOMDocument;
$dom->validateOnParse = true;
$dom->Load('book.xml');
?>`

### See Also

- DOMDocument::schemaValidate() - Validates a document based on a schema
- DOMDocument::schemaValidateSource() - Validates a document based on a schema
- DOMDocument::relaxNGValidate() - Performs relaxNG validation on the document
- DOMDocument::relaxNGValidateSource() - Performs relaxNG validation on the document

DOMDocument::schemaValidateSource
DOMDocument::xinclude
DOMDocument
PHP Manual