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XML For PHP Developers
by 
Sudheer Satyanarayana
http://techchorus.net
Bangalore PHP User Group Meetup
30 October 2010
Agenda
Quick introduction to XML basics
Recipe 1 - parsing RSS feed
Recipe 2 - creating Atom feed
Recipe 3 - scraping info...
XML Basics
XML document has a tree structure
XML documents can be validated using an XML schema
All major programming lang...
XML Parsers In PHP
simplexml
DOM
SAX
XMLReader
XMLWriter
Which Parser To Use
simplexml - really simple XML documents
DOM - heavy lifting
SAX - large XML documents
XMLReader - larg...
Recipe 1
simplexml usage
Programmatically retrieve weather information in your
location
Using Yahoo! Weather
parse RSS feed
RSS - Really Simple Syndication
Sample RSS document    
<?xml version="1.0" encoding="ISO-8859-1" ?>
<rss version="2.0">
<channel>
<title>My Home Page</ti...
Retrieving weather info from Yahoo!
http://weather.yahooapis.com/forecastrss?w=2442047&u=c
w = location, WOEID
u = degrees...
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<rss version="2.0"
xmlns:yweather="http://xml.weather.yahoo.com/n...
Visualization
PHP Code To Parse The Feed
<?php
$url = 'http://weather.yahooapis.com/forecastrss?w=2295420&u=c';
$document = file_get_con...
Output
Current Conditions:
Haze, 22 C
Forecast:
Tue - Partly Cloudy. High: 26 Low: 19
Wed - Isolated Thunderstorms. High: ...
Atom
Atom - key takeaways
Disagreements in RSS community
Atom entry document
Atom feed document
Atom Publishing Protocol
Use At...
Sample Atom Feed
<?xml version="1.0"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<link href="http://www.meetup.com/Bangal...
Atom Feed Structure
Atom Structure
<link href="..." rel="self">
<link href="..." rel="alternate">
<title>...</title>
<id>...</id>
<summary>......
Recipe 2
Generate an Atom feed
PHP DOM
Create An Atom Feed Document
<?php
$doc = DOMDocument::loadXML('<feed/>');
$root = $doc->documentElement;
$root->setAttrib...
Create Link Nodes
$node = $doc->createElement('link');
$link = $root->appendChild($node);
$link->setAttribute('href', 'htt...
Create Other Nodes
$root->appendChild(new DOMElement('title', 'PHP User Group Meet'));
$root->appendChild(new DOMElement('...
Create Entry Node
$node = $doc->createElement('entry');
$entry = $root->appendChild($node);
$node = $doc->createElement('l...
Create Other Nodes In Entry
$entry->appendChild(new DOMElement('title', 'October 2010 Meet'));
$entry->appendChild(new DOM...
Save As XML
$doc->formatOutput = TRUE;
print $doc->saveXML();
Scraping Websites
Grab HTML
Transform to XML
Use XPath to navigate the document
Use accessors to retrieve text content
Recipe 3
Retrieve list of members of Lok Sabha from Government
website
http://164.100.47.132/LssNew/Members/Alphabaticalli...
<table id="ctl00_ContPlaceHolderMain_Alphabaticallist1_dg1">
<tr>
<td>S.No.</td><td>Name of Member</td><td>Party Name</td>...
Building Xpath Expression
Find the table with the specified ID
//table[@id='ctl00_ContPlaceHolderMain_Alphabaticallist1_dg...
Final Xpath Expression
//table[@id='ctl00_ContPlaceHolderMain_Alphabaticallist1_dg1']
/tr[position()>1]
/td[position()=2]
...
PHP Script
<?php
$html = file_get_contents('http://164.100.47.132/LssNew/Members/Alphabaticallist.aspx');
$doc = new DOMDo...
QOTD
Retrieves quote of the day from Wikiquotes.org
Creates a feed
Also sends SMS to subscribers
http://qotd.techchorus.ne...
Where To Go From Here?
Start using XML right away
Now you know how to parse and create feeds
Learn more XML technologies
R...
Resources
Download files shown in this presentation -
http://techchorus.net/downloads/xml-for-php-developers/xml-for-php-d...
Questions?
Thank You
The slides will be available at SlideShare
http://www.slideshare.net/bngsudheer
My Twitter handle: @bngsudheer
B...
License
XML For PHP Developers by Sudheer Satyanarayana is
licensed under a Creative Commons Attribution-
NonCommercial-No...
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Transcript of "XML For PHP Developers"

  1. 1. XML For PHP Developers by  Sudheer Satyanarayana http://techchorus.net Bangalore PHP User Group Meetup 30 October 2010
  2. 2. Agenda Quick introduction to XML basics Recipe 1 - parsing RSS feed Recipe 2 - creating Atom feed Recipe 3 - scraping information from websites using XML Question and answer At the end of the session, you will be able to start using XML with PHP.
  3. 3. XML Basics XML document has a tree structure XML documents can be validated using an XML schema All major programming languages support reading and writing XML documents Hundreds of technologies are built on top of XML XHTML is one of the XML markup languages
  4. 4. XML Parsers In PHP simplexml DOM SAX XMLReader XMLWriter
  5. 5. Which Parser To Use simplexml - really simple XML documents DOM - heavy lifting SAX - large XML documents XMLReader - large XML documents Don't use: string manipulation to create XML documents regular expressions to parse XML documents
  6. 6. Recipe 1 simplexml usage Programmatically retrieve weather information in your location Using Yahoo! Weather parse RSS feed
  7. 7. RSS - Really Simple Syndication
  8. 8. Sample RSS document     <?xml version="1.0" encoding="ISO-8859-1" ?> <rss version="2.0"> <channel> <title>My Home Page</title> <link>http://www.example.com</link> <description>My RSS sample page</description> <item> <title>RSS Tutorial</title> <link>http://www.example.com/rss</link> <description>New RSS tutorial</description> </item> <item> <title>XML Tutorial</title> <link>http://www.example.com/xml</link> <description>New XML tutorial</description>
  9. 9. Retrieving weather info from Yahoo! http://weather.yahooapis.com/forecastrss?w=2442047&u=c w = location, WOEID u = degrees units (Fahrenheit or Celsius) http://weather.yahooapis.com/forecastrss?w=2295420&u=c
  10. 10. <?xml version="1.0" encoding="UTF-8" standalone="yes" ?> <rss version="2.0" xmlns:yweather="http://xml.weather.yahoo.com/ns/rss/1.0"> <channel> <item> <title>Conditions for Bangalore, IN at 8:30 pm IST</title> <description><![CDATA[ <img src="http://l.yimg.com/a/i/us/we/52/27.gif"/><br /> <b>Current Conditions:</b><br /> Mostly Cloudy, 24 C<BR /> <BR /><b>Forecast:</b><BR /> Wed - Partly Cloudy. High: 30 Low: 19<br /> Thu - Sunny. High: 33 Low: 20<br /> <br /> ]]> </description> </item> </channel> </rss>
  11. 11. Visualization
  12. 12. PHP Code To Parse The Feed <?php $url = 'http://weather.yahooapis.com/forecastrss?w=2295420&u=c'; $document = file_get_contents($url); $xml = new SimpleXMLElement($document); $output = $xml->channel->item->description; $text_output = strip_tags($output); echo $text_output;
  13. 13. Output Current Conditions: Haze, 22 C Forecast: Tue - Partly Cloudy. High: 26 Low: 19 Wed - Isolated Thunderstorms. High: 27 Low: 19 Full Forecast at Yahoo! Weather (provided by The Weather Channel)
  14. 14. Atom
  15. 15. Atom - key takeaways Disagreements in RSS community Atom entry document Atom feed document Atom Publishing Protocol Use Atom if you are a feed publisher
  16. 16. Sample Atom Feed <?xml version="1.0"?> <feed xmlns="http://www.w3.org/2005/Atom"> <link href="http://www.meetup.com/Bangalore-PHP-Users/" rel="self"/> <link href="http://www.meetup.com/Bangalore-PHP-Users/feed/atom.html" rel="alternate"/> <title>PHP User Group Meet</title> <id>http://example.com/my_unique_id.xml</id> <subtitle>Bangalore PHP Users</subtitle> <updated>2010-10-23T10:30:02Z</updated> <entry> <link href="http://www.meetup.com/Bangalore-PHP-Users/calendar/15022884/atom.xml" rel="self"/> <link href="http://www.meetup.com/Bangalore-PHP-Users/calendar/15022884/atom.html" rel="alternate"/> <title>October 2010 Meet</title> <summary>Great meetup</summary> <id>http://example.com/my_uique_feed_id.xml</id> <updated>2010-10-27T10:30:02Z</updated> <author> <name>Sudheer Satyanarayana</name> </author> </entry> </feed>
  17. 17. Atom Feed Structure
  18. 18. Atom Structure <link href="..." rel="self"> <link href="..." rel="alternate"> <title>...</title> <id>...</id> <summary>...</summary> <update>...</updated> <author><name>...</name></author>
  19. 19. Recipe 2 Generate an Atom feed PHP DOM
  20. 20. Create An Atom Feed Document <?php $doc = DOMDocument::loadXML('<feed/>'); $root = $doc->documentElement; $root->setAttribute('xmlns','http://www.w3.org/2005/Atom');
  21. 21. Create Link Nodes $node = $doc->createElement('link'); $link = $root->appendChild($node); $link->setAttribute('href', 'http://www.meetup.com/Bangalore-PHP-Users/'); $link->setAttribute('rel', 'self'); $node = $doc->createElement('link'); $link = $root->appendChild($node); $link->setAttribute('href', 'http://www.meetup.com/Bangalore-PHP- Users/feed/atom.html'); $link->setAttribute('rel', 'alternate');
  22. 22. Create Other Nodes $root->appendChild(new DOMElement('title', 'PHP User Group Meet')); $root->appendChild(new DOMElement('id', 'http://example.com/my_unique_id.xml')); $root->appendChild(new DOMElement('subtitle', 'Bangalore PHP Users')); $root->appendChild(new DOMElement('updated', '2010-10-23T10:30:02Z'));
  23. 23. Create Entry Node $node = $doc->createElement('entry'); $entry = $root->appendChild($node); $node = $doc->createElement('link'); $link = $entry->appendChild($node); $link->setAttribute('href', 'http://www.meetup.com/Bangalore-PHP- Users/calendar/15022884/atom.xml'); $link->setAttribute('rel', 'self'); $node = $doc->createElement('link'); $link = $entry->appendChild($node); $link->setAttribute('href', 'http://www.meetup.com/Bangalore-PHP- Users/calendar/15022884/atom.html'); $link->setAttribute('rel', 'alternate');
  24. 24. Create Other Nodes In Entry $entry->appendChild(new DOMElement('title', 'October 2010 Meet')); $entry->appendChild(new DOMElement('summary', 'Great meetup')); $entry->appendChild(new DOMElement('id', 'http://example.com/my_uique_feed_id. xml')); $entry->appendChild(new DOMElement('updated', '2010-10-27T10:30:02Z')); $node = $doc->createElement('author'); $author = $entry->appendChild($node); $author->appendChild(new DOMElement('name', 'Sudheer Satyanarayana'));
  25. 25. Save As XML $doc->formatOutput = TRUE; print $doc->saveXML();
  26. 26. Scraping Websites Grab HTML Transform to XML Use XPath to navigate the document Use accessors to retrieve text content
  27. 27. Recipe 3 Retrieve list of members of Lok Sabha from Government website http://164.100.47.132/LssNew/Members/Alphabaticallist.aspx
  28. 28. <table id="ctl00_ContPlaceHolderMain_Alphabaticallist1_dg1"> <tr> <td>S.No.</td><td>Name of Member</td><td>Party Name</td><td>Constituency (State)</td> </tr> <tr> <td> </td> <td> <a>Aaroon Rasheed,Shri J.M.</a> </td> <td>Indian National Congress</td> <td>Theni (Tamil Nadu ) </td> </tr> <tr> <td> </td> <td> <a>Abdul Rahman,Shri</a> </td> <td>Dravida Munnetra Kazhagam </td> <td> Vellore (Tamil Nadu ) </td> </tr> </table>
  29. 29. Building Xpath Expression Find the table with the specified ID //table[@id='ctl00_ContPlaceHolderMain_Alphabaticallist1_dg1'] Select all table rows after position 1 tr[position()>1] Select table cells with position 2 td[position()=2] Select anchor element a Select all children that are text nodes child::text()
  30. 30. Final Xpath Expression //table[@id='ctl00_ContPlaceHolderMain_Alphabaticallist1_dg1'] /tr[position()>1] /td[position()=2] /a /child::text()
  31. 31. PHP Script <?php $html = file_get_contents('http://164.100.47.132/LssNew/Members/Alphabaticallist.aspx'); $doc = new DOMDocument(); $doc->loadHtml($html); $domxpath = new DOMXPath($doc); $xpath_expression = "//table[@id='ctl00_ContPlaceHolderMain_Alphabaticallist1_dg1']/tr[position() >1]/td[position()=2]/a/child::text()"; $result = $domxpath->evaluate($xpath_expression); echo "Total number of memembers of Lok Sabha " . $result->length; foreach ($result as $r) { echo "n" . $r->nodeValue; }
  32. 32. QOTD Retrieves quote of the day from Wikiquotes.org Creates a feed Also sends SMS to subscribers http://qotd.techchorus.net http://labs.google.co.in/smschannels/channel/WikiQuoteOfTheDay
  33. 33. Where To Go From Here? Start using XML right away Now you know how to parse and create feeds Learn more XML technologies Read the specifications Scrape websites Imagination is your limit Build the next big thing since sliced bread!
  34. 34. Resources Download files shown in this presentation - http://techchorus.net/downloads/xml-for-php-developers/xml-for-php-developers.tar.gz http://techchorus.net/downloads/xml-for-php-developers/xml-for-php-developers.zip PHP Manual - http://in3.php.net/manual/en/refs.xml.php Tech Chorus - http://techchorus.net W3Schools - http://www.w3schools.com/xml/default.asp Book - Pro PHP And XML Web Services by Robert Richards. Review - http://techchorus.net/pro-php-xml- and-web-services-book-review More useful links - http://xml.farsquare.com/
  35. 35. Questions?
  36. 36. Thank You The slides will be available at SlideShare http://www.slideshare.net/bngsudheer My Twitter handle: @bngsudheer Blog: http://techchorus.net Business: http://binaryvibes.co.in E-mail: sudheer @ above business URL
  37. 37. License XML For PHP Developers by Sudheer Satyanarayana is licensed under a Creative Commons Attribution- NonCommercial-NoDerivs 2.5 India License . Based on a work at techchorus.net . Permissions beyond the scope of this license may be available at http://techchorus.net .
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