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DOMDocument->schemaValidate()

nevyn at NOSPAM dot email dot it
18-Dec-2006 05:41


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.

justin at redwiredesign dot com
08-Nov-2006 03:32


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.

Mike A.
17-Feb-2006 12:03


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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