What are the different ways to implement SOAP in PHP4?

To implement SOAP in PHP4, you can use the NuSOAP library which provides a simple way to create SOAP clients and servers. First, download the NuSOAP library and include the necessary files in your PHP script. Then, create a new NuSOAP client object and call the SOAP method on the server.

// Include the NuSOAP library
require_once('nusoap.php');

// Create a new NuSOAP client object
$client = new soapclient('http://example.com/soap_server.php');

// Call the SOAP method on the server
$response = $client->call('helloWorld', array('name' => 'John'));

// Display the response
echo $response;