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PHP and Web Services
      CITOT - May    20th   2007
   Bruno Pedro <bpedro@computer.org>
Summary
 • What is PHP?
 • Web Services
  • SOAP
  • REST
  • JSON
 • Conclusions
PHP and Web Services      2
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
How is PHP used?

  • Content Management
  • Forums
  • Blogging
  • Wiki
  • CRM
PHP and Web Services   4
Who uses PHP?




                              Source: Zend



PHP and Web Services   5
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
The PHP language


                           Easy syntax!




PHP and Web Services   7
Creating a function
                           function declaration


                            return value


                            function call




PHP and Web Services   8
Creating a class
                           class declaration


                           public method




                            method call


PHP and Web Services   9
Web Services




                                  Source:The Server Side
                              (http://tinyurl.com/38umxt)

PHP and Web Services    10
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
Requirements

  • PHP 5.2.2
  • SOAP
  • simplexml
  • DOM
  • JSON
PHP and Web Services   12
SOAP




                                     Source: Prentice Hall
                              (http://tinyurl.com/33dcch)


PHP and Web Services    13
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
Server implementation

                                               namespace




                                               start a server
                                        assign a class
                            handle incoming calls

PHP and Web Services   15
Client implementation
                                namespace




                                   endpoint



          display result

PHP and Web Services       16
Output
                                   namespace




                          result

PHP and Web Services     17
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
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
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
Server implementation
                                handle incoming call



                                      create an
                                      XML document

                                             add elements

                            output result

PHP and Web Services   21
Client implementation

                                        endpoint

                                     arguments



                                 load XML document

            output result

PHP and Web Services        22
Output



                              result




PHP and Web Services     23
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
JSON




                                 JSON Logo
                             Source: json.org




PHP and Web Services    25
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
Server implementation

                            handle incoming call



                                         generate result


                                          output
                                          JSON string

PHP and Web Services   27
Client implementation
                                            endpoint



                                                       arguments




                       output result


PHP and Web Services                   28
Output



                              result




PHP and Web Services     29
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
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
Questions?




PHP and Web Services       32
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

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PHP and Web Services

  • 1. PHP and Web Services CITOT - May 20th 2007 Bruno Pedro <bpedro@computer.org>
  • 2. Summary • What is PHP? • Web Services • SOAP • REST • JSON • Conclusions PHP and Web Services 2
  • 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
  • 4. How is PHP used? • Content Management • Forums • Blogging • Wiki • CRM PHP and Web Services 4
  • 5. Who uses PHP? Source: Zend PHP and Web Services 5
  • 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
  • 7. The PHP language Easy syntax! PHP and Web Services 7
  • 8. Creating a function function declaration return value function call PHP and Web Services 8
  • 9. Creating a class class declaration public method method call PHP and Web Services 9
  • 10. Web Services Source:The Server Side (http://tinyurl.com/38umxt) PHP and Web Services 10
  • 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
  • 12. Requirements • PHP 5.2.2 • SOAP • simplexml • DOM • JSON PHP and Web Services 12
  • 13. SOAP Source: Prentice Hall (http://tinyurl.com/33dcch) PHP and Web Services 13
  • 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
  • 15. Server implementation namespace start a server assign a class handle incoming calls PHP and Web Services 15
  • 16. Client implementation namespace endpoint display result PHP and Web Services 16
  • 17. Output namespace result PHP and Web Services 17
  • 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
  • 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
  • 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
  • 21. Server implementation handle incoming call create an XML document add elements output result PHP and Web Services 21
  • 22. Client implementation endpoint arguments load XML document output result PHP and Web Services 22
  • 23. Output result PHP and Web Services 23
  • 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
  • 25. JSON JSON Logo Source: json.org PHP and Web Services 25
  • 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
  • 27. Server implementation handle incoming call generate result output JSON string PHP and Web Services 27
  • 28. Client implementation endpoint arguments output result PHP and Web Services 28
  • 29. Output result PHP and Web Services 29
  • 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
  • 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
  • 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