What are best practices for setting attributes and prefixes in the Envelope tag when using PHP SOAP?

When using PHP SOAP, it is important to properly set attributes and prefixes in the Envelope tag to ensure compatibility with the SOAP server. To do this, you can use the SoapVar class to create the necessary elements with the correct attributes and prefixes. By setting these values correctly, you can ensure that your SOAP requests are formatted properly and can be successfully processed by the server.

$namespace = 'http://example.com/namespace';
$soapVar = new SoapVar(
    '<Request><Data>Sample Data</Data></Request>', 
    XSD_ANYXML, 
    null, 
    null, 
    null, 
    $namespace
);

$header = new SoapHeader($namespace, 'Request', $soapVar);
$client->__setSoapHeaders($header);