PHP And Web Services: Perfect Partners

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PHP and Web Services:
Perfect Partners

About Me
●
Lorna Jane Mitchell
●
PHP Developer/Trainer/Consultant at Ibuildings
●
Hosting DPC
●
...

PHP
●
PHP: "solving the web problem"
●
The problem evolves
●
PHP evolves

PHP
●
Server
●
Client
●
Web application tool
●
Command line tool
●
GTK ...

PHP
●
Ubiquitous
●
Runs on your platform
●
*nix
●
mac
●
windows (yes really, r...

Web Services
●
"scalable, reusable libraries"
●
Interface over HTTP
●
Modular application design

Architecture

Traditional Architecture

Traditional Architecture

Additional Channels

Services Architecture

Inside The Service Layer

Data Formats

JSON
●
JavaScript Object Notation
●
Natively read/write in most languages
●
Very simple! (we like simple)
●
...

Writing JSON from PHP
1 <?php
2
3 $menu['starter'] = array( "prawn cocktail",
4 ...

Reading JSON from PHP
1 <?php
2
3 $json = '{"starter":["prawn cocktail","soup of the
day"],"main course":["roa...

Reading JSON from PHP
stdClass Object
(
[starter] => Array
(
[0] => prawn cocktail
[1]...

XML
●
eXtensible Markup Language
●
Familiar
●
Can give more detail than JSON
●
Native read/write in most l...

Working with XML from PHP
●
Lots of options
●
SimpleXML
●
DOM

SimpleXML Example
1 <?php
2
3 $xml = <<< XML
4 <?xml version="1.0" ?>
5 <menus>
6 <menu>Lunch</menu>
...

SimpleXML Example
object(SimpleXMLElement)#1 (1) {
["menu"]=>
array(5) {
[0]=>
string(5) "Lunch"
[1]=>
...

SimpleXML Example
1 <?php
2
3 $simplexml = simplexml_load_string('<?xml version="1.0"
?><menus/>');
4 $sim...

SimpleXML Example

<?xml version="1.0"?>
<menus>
<menu>Lunch</menu>
<menu>Dinner</menu>
<menu>Dessert</menu>
...

Service Types

Service Types
●
*-RPC
– XML-RPC

– JSON-RPC

●
SOAP
●
REST

RPC
●
All URLs point to a single endpoint
●
Parameters give method names
●
Request body can take a variety of ...

Example RPC services
●
Using Flickr's XML-RPC
●
Test method: just echoes back to user
●
XML formatted data

Flickr Echo Example: XML
<?xml version="1.0"?>
<methodCall>
<methodName>flickr.test.echo</methodName>
<params>
<pa...

RPC from PHP: curl
1 <?php
2
3 // $xml is existing SimpleXMLElement Object
4 $url = 'http://api.flickr.com/servi...

RPC from PHP: pecl_http
1 <?php
2
3 $url = 'http://api.flickr.com/services/xmlrpc/';
4
5 // procedural method
...

Flickr Response
<?xml version="1.0" encoding="utf-8" ?>
<methodResponse>
<params>
<param>
<value>
<str...

RPC Advantages
●
RPC is a great format for wrapping existing
functionality
●
Can abstract between existing sys...

Delivering RPC
●
Consumers will need
– Service URL

– Docs of functions and arguments

– If this was an ex...

Wrapping RPC
●
RPC is a library-like interface
●
Can easily wrap existing libraries to call like this
●
Can wr...

$Wrapping RPC Example 1 <?php 2 3 class Handler 4 { 5 function __call($method, $args) { 6 $ch = curl_i...$

SOAP
●
Special case of RPC using XML
●
Has given formats for messages and errors
●
Libraries exist for creatin...

PHP SOAP Server Example

require_once('lib/myClass.php');

$server = new SoapServer("service.wsdl");
$server->setClass("M...

PHP SOAP Client Example

$wsdl = "Service.wsdl";
$client = new SoapClient($wsdl, $params);

$output = $client->requestSho...

WSDL
●
Web Service Description Language
●
Widely used with SOAP
●
Describes the methods, arguments and data
...

WSDL
<?xml version ='1.0' encoding ='UTF-8' ?>
<definitions name='MyClass' targetNamespace='urn:MyClassInventory' ...

Delivering SOAP
●
In WSDL mode, only the WSDL needs to be
supplied
●
Otherwise method names, arguments and
...

REST
●
A series of concepts
●
Generally uses HTTP (HyperText Transfer
Protocol)
●
URLs are resource locati...

Implementing REST
●
Standard application architecture
●
Routing to map requests to internal functionality
●
Ou...

REST CRUD
Action HTTP Verb

Retrieve GET

Create POST

Update PUT

Delete DELETE

REST Examples
●
GET
●
http://localhost/users
●
http://localhost/users/harry

●
POST
●
...

REST from PHP: GET
1 <?php
2
3 $result = file_get_contents('http://localhost/users');
4 var_dump($result);

REST from PHP: GET
1 <?php
2
3 $ch = curl_init('http://localhost/users');
4
5 curl_exec($ch);

●
...

REST from PHP: POST
1 <?php
2
3 $ch = curl_init('http://localhost/users');
4
5 $data = array ("name" => "Cho Ch...

REST from PHP: PUT
1 <?php
2
3 $ch = curl_init('http://localhost/users/cho');
4
5 $data = array ("name" => "Cho...

REST from PHP: DELETE
1 <?php
2
3 $ch = curl_init('http://localhost/users/ginny');
4
5 curl_setopt($ch, CURLOPT_CUST...

Delivering REST
●
Full documentation including URL formats, data
types, and response formats
●
Must include in...

REST as an inspiration
●
RESTful is a strict definition
●
REST is full of great ideas
●
REST is great for clea...

Resources
●
RESTful Web Services – Leonard Richardson
and Sam Ruby
●
http://php.net
●
http://benramsey.com...

Questions ???

Thankyou
●
Lorna Jane Mitchell
●
http://ibuildings.com
●
http://lornajane.net
●
@lornajane

●
http:/...

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