PHP and Web Services

Slide 1: PHP and Web Services CITOT - May 20th 2007 Bruno Pedro <bpedro@computer.org>

Slide 2: Summary • What is PHP? • Web Services • SOAP • REST • JSON • Conclusions PHP and Web Services 2

Slide 3: What is PHP? • PHP: Hypertext Preprocessor • Open Source Web scripting language • Created in 1994 • Syntax inherited from C, Java and Perl • Powerful, yet easy to learn PHP and Web Services 3

Slide 4: How is PHP used? • Content Management • Forums • Blogging • Wiki • CRM PHP and Web Services 4

Slide 5: Who uses PHP? Source: Zend PHP and Web Services 5

Slide 6: Why use PHP? • Used by 20M+ Web Sites around the globe • Community-maintained documentation • Code runs on UNIX, OSX and Windows • Backed commercially by Zend • Easy syntax PHP and Web Services 6

Slide 7: The PHP language Easy syntax! PHP and Web Services 7

Slide 8: Creating a function function declaration return value function call PHP and Web Services 8

Slide 9: Creating a class class declaration public method method call PHP and Web Services 9

Slide 10: Web Services Source:The Server Side (http://tinyurl.com/38umxt) PHP and Web Services 10

Slide 11: What are Web Services? • Interoperable interactions • Calls are made over a network • Lots of different standards • Popular Web sites use them PHP and Web Services 11

Slide 12: Requirements • PHP 5.2.2 • SOAP • simplexml • DOM • JSON PHP and Web Services 12

Slide 13: SOAP Source: Prentice Hall (http://tinyurl.com/33dcch) PHP and Web Services 13

Slide 14: SOAP • Simple Object Access Protocol • Usually an HTTP POST request • Call is encapsulated in XML • Response is an XML document • PHP handles everything PHP and Web Services 14

Slide 15: Server implementation namespace start a server assign a class handle incoming calls PHP and Web Services 15

Slide 16: Client implementation namespace endpoint display result PHP and Web Services 16

Slide 17: Output namespace result PHP and Web Services 17

Slide 18: SOAP • Support for SOAP 1.1, 1.2 and WSDL 1.1 • Handles simple and complex types • Very easy implementation • Output is quite bulky PHP and Web Services 18

Slide 19: REST «interface» /calculator/sum/ Resource GET - perform a calculation GET PUT - not used PUT POST - not used POST DELETE - not used DELETE http://example.com/calculator/sum/?x=121&y=233 PHP and Web Services 19

Slide 20: REST • Representational State Transfer • Usually an HTTP GET request • Call is made through GET parameters • Response is an XML document • Create response with DOM • Interpret response with simplexml PHP and Web Services 20

Slide 21: Server implementation handle incoming call create an XML document add elements output result PHP and Web Services 21

Slide 22: Client implementation endpoint arguments load XML document output result PHP and Web Services 22

Slide 23: Output result PHP and Web Services 23

Slide 24: REST • Interaction needs to be implemented • XML schema must be know beforehand • Complex types not handled natively • Output is usually RSS PHP and Web Services 24

Slide 25: JSON JSON Logo Source: json.org PHP and Web Services 25

Slide 26: JSON • JavaScript Object Notation • REST approach • Except response is not XML • Used on the client side • Create response with json_encode() • Interpret response in JavaScript PHP and Web Services 26

Slide 27: Server implementation handle incoming call generate result output JSON string PHP and Web Services 27

Slide 28: Client implementation endpoint arguments output result PHP and Web Services 28

Slide 29: Output result PHP and Web Services 29

Slide 30: JSON • REST approach • Handles simple and complex types • Calls can be made with AJAX • Can also be used on the server side PHP and Web Services 30

Slide 31: Conclusions • PHP is a powerful web scripting language • Too many Web Services standards • PHP handles all the internals • REST requires more coding than SOAP • Use JSON for client side applications • XML-RPC support is still experimental PHP and Web Services 31

Slide 32: Questions? PHP and Web Services 32

Slide 33: Resources • My blog: http://unfoldingtheweb.com/ • PHP Manual: http://www.php.net/ • SOAP: http://www.w3.org/TR/soap/ • REST: http://tinyurl.com/akhc7 • JSON: http://www.json.org/ PHP and Web Services 33