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PHP : Function Reference : DOM Functions : DOMDocument->schemaValidate()

DOMDocument->schemaValidate()

Validates a document based on a schema ()

DOMDocument{
boolschemaValidate(stringfilename);
}

Validates a document based on the given schema file.

Parameters

filename

The path to the schema.

Return Values

Returns TRUE on success or FALSE on failure.

Related Examples ( Source code ) » dom domdocument schemavalidate



Code Examples / Notes » dom domdocument schemavalidate

justin

In his previous comment, Mike A wrote about validating documents using an XSD. However, you can validate without one. In my case, I needed to ensure that the content entered was just valid XML or not, and I couldn't find an XSD to support that. So I wrote this:
public static function validate($xml)
{
libxml_use_internal_errors(true);
$doc = new DOMDocument('1.0', 'utf-8');
$doc->loadXML($xml);
$errors = libxml_get_errors();
if (empty($errors))
{
return true;
}
$error = $errors[0];
if ($error->level < 3)
{
return true;
}
$lines = explode("\r", $xml);
$line = $lines[($error->line)-1];
$message = $error->message.' at line '.$error->line.':<br />'.htmlentities($line);
return $message;
}
The catch here is that the function only checks for the first error is LIBXML_ERR_FATAL, which would break XSL/XML compilation.
In my experience, the errors are returned by libxml_get_errors in descending severity, so this may be an OK thing to do.


nevyn

I've seen that trying to validate an XML with a schema containing keys, they were ignored, and the XML was considered still valid altough it contained duplicate keys.

mike a.

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
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();
}
?>
Old error message:
Warning: DOMDocument::schemaValidate() [function.schemaValidate]: Element 'child_integer': 'Error condition.' is not a valid value of the atomic type 'xs:integer'. in example.php on line 40
New error message:
DOMDocument::schemaValidate() Generated Errors!
Error 1824: Element 'child_integer': 'Error condition.' is not a valid value of the atomic type 'xs:integer'. in example.xml on line 4


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