What best practices should be followed when creating a SOAP server in PHP that expects complex data types as parameters and return values?

When creating a SOAP server in PHP that expects complex data types as parameters and return values, it is important to properly define and handle these data types using the SOAP extension. This can be achieved by using the SOAP-ENV:encoding namespace to define complex data structures and ensuring that the data is properly serialized and deserialized. Additionally, it is recommended to use WSDL (Web Services Description Language) to define the data types and operations of the SOAP server.

<?php
// Define complex data types using SOAP-ENV:encoding namespace
class ComplexDataType {
    public $property1;
    public $property2;
}

// Create a SOAP server
$server = new SoapServer(null, array('uri' => "http://example.com/soap-server"));
$server->setClass('YourSoapClass');
$server->handle();

// Define your SOAP class with methods that expect and return complex data types
class YourSoapClass {
    public function yourMethod(ComplexDataType $param) {
        // Handle the complex data type
        return $param;
    }
}
?>