validate a xml file against a xsd using php - php

Question

how to validate a xml file against a xsd? there is domdocument::schemaValidate() but It does not tell where are the errors. is there any class for that? does it have any worth making that parser from scratch? or is it just reinventing he wheel,

Answer 1

This code does the business:
$xml= new DOMDocument();
$xml->loadXML(<A string goes here containing the XML data>, LIBXML_NOBLANKS); // Or load if filename required
if (!$xml->schemaValidate(<file name for the XSD file>)) // Or schemaValidateSource if string used.
{
// You have an error in the XML file
}
See the code in http://php.net/manual/en/domdocument.schemavalidate.php To retrieve the errors.
I.e.
justin at redwiredesign dot com 08-Nov-2006 03:32 post.

Answer 2

User contrib from http://php.net/manual/en/domdocument.schemavalidate.php
It works like a charm!
For more detailed feedback from DOMDocument::schemaValidate, disable
libxml errors and fetch error information yourself. See
http://php.net/manual/en/ref.libxml.php for more info.
example.xml
<?xml version="1.0"?>
<example>
<child_string>This is an example.</child_string>
<child_integer>Error condition.</child_integer>
</example>
example.xsd
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified">
<xs:element name="example">
<xs:complexType>
<xs:sequence>
<xs:element name="child_string" type="xs:string"/>
<xs:element name="child_integer" type="xs:integer"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
PHP
<?php
function libxml_display_error($error)
{
$return = "<br/>\n";
switch ($error->level) {
case LIBXML_ERR_WARNING:
$return .= "<b>Warning $error->code</b>: ";
break;
case LIBXML_ERR_ERROR:
$return .= "<b>Error $error->code</b>: ";
break;
case LIBXML_ERR_FATAL:
$return .= "<b>Fatal Error $error->code</b>: ";
break;
}
$return .= trim($error->message);
if ($error->file) {
$return .= " in <b>$error->file</b>";
}
$return .= " on line <b>$error->line</b>\n";
return $return;
}
function libxml_display_errors() {
$errors = libxml_get_errors();
foreach ($errors as $error) {
print libxml_display_error($error);
}
libxml_clear_errors();
}
// Enable user error handling
libxml_use_internal_errors(true);
$xml = new DOMDocument();
$xml->load('example.xml');
if (!$xml->schemaValidate('example.xsd')) {
print '<b>DOMDocument::schemaValidate() Generated Errors!</b>';
libxml_display_errors();
}
?>

Answer 3

This is a complete code snippet for displaying xsd validation errors:
$xml = '<test/>';
$xsd = '/path/to/xsd';
// needed for getting errors
libxml_use_internal_errors(true);
$domDocument= new DOMDocument();
$domDocument->loadXML($xml);
if (!$domDocument->schemaValidate($xsd)) {
$errors = libxml_get_errors();
foreach ($errors as $error) {
print_r($error);
}
libxml_clear_errors();
}