DOMDocument->schemaValidate()

Validates a document based on a schema ()

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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.': '.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) { $return = " \n"; switch ($error->level) { case LIBXML_ERR_WARNING: $return .= "Warning $error->code: "; break; case LIBXML_ERR_ERROR: $return .= "Error $error->code: "; break; case LIBXML_ERR_FATAL: $return .= "Fatal Error $error->code: "; break; } $return .= trim($error->message); if ($error->file) { $return .= " in $error->file"; } $return .= " on line $error->line\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 'DOMDocument::schemaValidate() Generated Errors!'; 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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