Web Services Tutorial 2

RPC Video TutorialIn this part of my web services tutorial I cover 2 ways to create XML from a database. I then show a simple example on how Remote Procedure Calls work.

If you missed the previous web services tutorial, where I showed how to work with JSON data, you should watch that first. All of the code used in this video can be found below.

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Code from the Video



// Tell whomever is receiving this data the content type
// Needs to be set on the first line
// header('Content-Type: text/xml');

// Insert to the StudentDB class

// XML is used when you want to provide detailed information
// about your data like attributes and data type

$dale_cooper = array("Dale", "Cooper", "123 Main St",
	"Seattle", "Washington");
// Define that all data will be between 2 <student> tags </student>
$xml = new SimpleXMLElement("<student />");

// Get each piece of data from the array and put it between <data> tags
foreach($dale_cooper as $info){

	$xml->addChild("data", $info);


// Generate a DOM document we can style
// A DOM Document represents an entire XML document
$dom = dom_import_simplexml($xml)->ownerDocument;

// State we want the data to be indented
$dom->formatOutput = true;

// saveXML converts the XML into a string to print
echo $dom->saveXML();

// Get a connection to the database

// Check the connection
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());

// Query retrieves the student data
$query = "SELECT * FROM students WHERE student_id = 1";

// Will hold all students retreived
$student_array = array();

if($result = $dbc->query($query)){

	while ($obj = $result->fetch_object()){
		printf("%s %s %s %s %s %s %s %s %s %s %s %s %s <br />",
		$obj->first_name, $obj->last_name, $obj->email,
		$obj->street, $obj->city, $obj->state, $obj->zip,
		$obj->phone, $obj->birth_date, $obj->sex, 
		$obj->date_entered, $obj->lunch_cost, $obj->student_id);
		$temp_student = new StudentDB($obj->first_name, 
		$obj->last_name, $obj->email, $obj->street,
		$obj->city, $obj->state, $obj->zip, $obj->phone, 
		$obj->birth_date, $obj->sex, $obj->date_entered, 
		$obj->lunch_cost, $obj->studentid);
		$student_array[] = $temp_student;

echo '<?xml version="1.0" encoding="UTF-8" ?>';

echo '<students>';

// Cycle through all the students and print them surrounded by tags
foreach($student_array[0] as $key=>$value){

	echo '<' . $key . '>' . $value . '</' . $key . '>';


echo '</students>';




class Students{

public function getStudentFirstName(){

    $studentFN = array("Dale", "Harry", "Shelly", "Bobby",
			"Donna", "Audrey", "James", "Lucy", "Tommy",
			"Andy", "John");
    return $studentFN;


    public function getStudentLastName(){

        $studentLN = array("Cooper", "Truman", "Johnson", "Briggs",
			"Hayward", "Horne", "Hurley", "Moran", "Hill",
			"Brennan", "Smith");
        return $studentLN;






// RPC (Remote Procedure Call) is used to call a function remotely
// You include the function name to execute and maybe attributes

// Insert to the Students class

$student_data = new Students();


	case "Get First Names" :
		$student_info = $student_data->getStudentFirstNames();
	case "Get Last Names" :
		$student_info = $student_data->getStudentLastNames();
	echo json_encode($student_info);



<form action="rpc_code.php" method="post">

<select name="request">

<option>Get First Names</option>
<option>Get Last Names</option>


<input type="submit" name="submit">



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