Help with multiple values in an ajax call

I’ve got a reference field to the ‘cmdb_ci’ table, that onChange should then perform various populations and field manipulations. I’m having difficulties with passing multiple values back to the client script.

Client Script – 

function onChange(control, oldValue, newValue, isLoading) {
	if (isLoading || newValue == '') {
		return;
	}
	
	console.log('newValue: ' + newValue); // returns sys_id as expected
	
	// Call the Ajax include
	var ga = new GlideAjax('u_NewMSSQLInstanceAjax');
	ga.addParam('sysparm_name', 'validateSQLHost');
	ga.addParam('sysparm_host_id', newValue);
	ga.getXMLAnswer(function(clusterName){
		
		var answer = clusterName.responseXML.documentElement.getAttribute("clusterName");
		console.log('answer: ' + answer); // Getting an error here - "Uncaught TypeError: Cannot read property 'documentElement' of undefined"
		//answer = answer.evalJSON(); //Transform the JSON string to an object
		
		// If there is a relationship
		if (answer.parent) {
			// Hide any existing field messages
			g_form.hideFieldMsg('mssql_host', true);
			
			// Update the value
			g_form.setValue('mssql_host', answer.parent);
			
			// Display a message to the user so they know why it was updated
			var msg = 'The server you selected is a cluster node. The selection has been updated to show the cluster name instead of the node.';
			if (typeof spModal != 'undefined') {
				spModal.alert(msg);
			}
			else {
				alert(msg);
			}
		}
		
		// If host environment is not blank
		if (answer.env) {
			// Set the environment class and read-only
			g_form.setValue('mssql_environment_class', answer.env);
			g_form.setReadOnly('mssql_environment_class', true);
		}
	});
}

Script Include – 

var u_NewMSSQLInstanceAjax = Class.create();
u_NewMSSQLInstanceAjax.prototype = Object.extendsObject(AbstractAjaxProcessor, {
	
	validateSQLHost: function () {
		// Declare result
		var result = {};
			result.parent = "";
			result.env = "";
			
			// Get parameters
			var hostID = this.getParameter('sysparm_host_id');
			
			// Query for a parent cluster record
			var grCiRel = new GlideRecord('cmdb_rel_ci');
			grCiRel.addQuery('type',  // Type of 'Cluster Nodes::Cluster Node for'.
			grCiRel.addQuery('child', hostID);
			grCiRel.query();
			
			// If we found a parent cluster
			if (grCiRel.next()) {
				// Update the result to the parent sys_id
				result.parent = grCiRel.getValue('parent');
			}
			
			// Query for the environment class of the host
			var grCI = new GlideRecord('cmdb_ci');
			grCI.get('hostID');
			result.env = grCI.getValue('u_env_class');
			
			
			var json = new JSON();
			var data = json.encode(result); // JSON formatted string
			
			// Return the result
			return data;
		},
		
		type: 'u_NewMSSQLInstanceAjax'
	});

How to post multiple parameters to the server?

$('#example').DataTable({
        "processing": true,
        "serverSide": true,
        "ajax": {
            "url": "../Home/GetSomeData",
            "dataType":"JSON",
            "type": "POST",
            "data": function (d) {
                return $.extend({}, d, {
                    "objectParameter": someObject,
                    "booleanParameter": booleanValue,
                    "arrayParmeter": someArray,
                });
            }
 
        },

Receiving Multiple Parameters into PHP from jQuery Ajax Call

$("#submissionform form").submit(function(e){
			var origEmail = $('#go').val();
			var confirmEmail = $("#confirmemail").val();
			var name = $("#name").val();
			var age = $("#age").val();
			var country = $("#country").val();
		
			$.ajax({
			  type: "POST",
			  dataType: 'json',
			  cache: false,
			  url: "Scripts/confirmform.php",
			  data: { origEmail: origEmail,
			        confirmEmail: confirmEmail,
					name: name,
					age: age,
					country: country },
			  success: function(data){
				  testSecondResults(data);
			  }
			});
		});
      });

I want to be able to receive those parameters into the PHP script for all the values into the following PHP script (filename: confirmform.php).

<?php
	$instance = new CheckForm;
	$instance -> checkSubmission();
	
	class CheckForm
	{
		public function checkSubmission()
		{	
			$response = array("validation" => " ", "message" => " ");	
			if ($_POST['country'] != "Select Country")
			{
				if (isset($_POST['confirmemail']) && isset($_POST['name']))
				{
					$origEmail = $_GET['go'];
					$confirmEmail = $_POST['confirmemail'];
					if ($origEmail == $confirmEmail)
					{
						$name = htmlspecialchars($_POST['name']);
						$ageRange = $_POST['age'];
						$country = $_POST['country'];
						
						require_once('databasewriter.php');
						$dbWriter = new DatabaseWriter;
						$dbWriter -> writeUserToDatabase($confirmEmail, $name, $ageRange, $country, $category);
						$response = array("validation" => "pass", "message" => 'Thanks for joining the e-mail list, ' . $name . ', under the e-mail address, ' . $confirmEmail . '.');
					} else {
						$response = array("validation" => "fail", "message" => 'E-mail addresses don\\'t match.');
						die();
					}
				} else {
					if (!isset($_POST['confirmemail'])){
						$response = array("validation" => "fail", "message" => 'Confirmation e-mail not entered.');
					} elseif (!isset($_POST['name'])) {	
						$response = array("validation" => "fail", "message" => 'Please enter a name.');
					}
				}
			} else {
				$response = array("validation" => "fail", "message" => 'Please select a country.');
			}
			echo json_encode($response);
		}
	}
?>