Download as PDF, PPTX
![DOMXpath
â—Ź Create after loading the document!
â—Ź evaluate()/query()
<?php
$str = '<sample><element/></sample>';
$dom = new DOMDocument();
$dom->loadXML($str);
$xpath = new DOMXPath($dom);
var_dump($xpath->evaluate('//element'));
var_dump($xpath->evaluate('//noelement'));
var_dump($xpath->evaluate('//noelement/@attr'));
?>
object(DOMNodeList)[5]](https://image.slidesharecdn.com/lumberjack-100502084705-phpapp01/85/Lumberjack-XPath-101-7-320.jpg)
![SimpleXML
â—Ź Always return SimpleXML
<?php
$str = '<sample><element/></sample>';
$xml = simplexml_load_string($str);
var_dump($xml->xpath('//element'));
var_dump($xml->xpath('//noelement'));
var_dump($xml->xpath('//noelement/@attr'));
?>
array array boolean false
0 => empty
object(SimpleXMLElement)[2]](https://image.slidesharecdn.com/lumberjack-100502084705-phpapp01/85/Lumberjack-XPath-101-8-320.jpg)
![Syntax
/element/child[@attr]
Absolute Path Step 1 Predicate
Separator Step 2](https://image.slidesharecdn.com/lumberjack-100502084705-phpapp01/85/Lumberjack-XPath-101-10-320.jpg)
![Node Functions
â—Ź count() â—Ź name()
â—Ź last() â—Ź local-name()
â—Ź position() â—Ź namespace-uri()
$list = $xpath->evaluate(
'//*[local-name() = 'li' and position() = last()]'
);](https://image.slidesharecdn.com/lumberjack-100502084705-phpapp01/85/Lumberjack-XPath-101-20-320.jpg)
![CSS Selectors
â—Ź JavaScript libraries
â—Ź element nodes
â—Ź *
â—Ź no axes
â—Ź descendant-or-self::*
â—Ź can ignore namespaces
â—Ź descendant-or-self::*[local-name() = '...']](https://image.slidesharecdn.com/lumberjack-100502084705-phpapp01/85/Lumberjack-XPath-101-26-320.jpg)
Uploaded byThomas Weinert
Lumberjack XPath 101
This document provides an overview of XPath including: - XPath is used to select nodes or node-sets from XML documents - It describes the major axes like child, descendant, and attribute - Functions for selecting nodes, casting types, and working with strings and namespaces - Tools for testing XPath queries include Firebug and browser extensions - XPath shares similarities with CSS selectors but has additional capabilities for XML documents
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Lumberjack XPath 101
- 1. #PBCAT The Lumberjack - Xpath 101 Thomas Weinert
- 2. About Me â—Ź Application Developer â—Ź PHP â—Ź JavaScript â—Ź XSL â—Ź papaya Software GmbH â—Ź papaya CMS â—Ź Technical Director â—Ź FluentDOM
- 3. Questions! Please ask any time!
- 4. Xpath 1 â—Ź XML Path Language â—Ź W3C Recommendation 16 November 1999 â—Ź Used by â—Ź XSLT 1 â—Ź XPointer
- 5. Xpath 2 â—Ź W3C Recommendation 23 January 2007 â—Ź Superset of Xpath 1 â—Ź More data types
- 6. DOM â—Ź Document Object Modell â—Ź Standard extension: ext/dom â—Ź LibXml2 â—Ź Xpath 1
- 7. DOMXpath â—Ź Create after loading the document! â—Ź evaluate()/query() <?php $str = '<sample><element/></sample>'; $dom = new DOMDocument(); $dom->loadXML($str); $xpath = new DOMXPath($dom); var_dump($xpath->evaluate('//element')); var_dump($xpath->evaluate('//noelement')); var_dump($xpath->evaluate('//noelement/@attr')); ?> object(DOMNodeList)[5]
- 8. SimpleXML â—Ź Always return SimpleXML <?php $str = '<sample><element/></sample>'; $xml = simplexml_load_string($str); var_dump($xml->xpath('//element')); var_dump($xml->xpath('//noelement')); var_dump($xml->xpath('//noelement/@attr')); ?> array array boolean false 0 => empty object(SimpleXMLElement)[2]
- 9. XSL â—Ź Libxslt â—Ź based on Libxml2 â—Ź ext/xsl â—Ź ext/xslcache
- 10. Syntax /element/child[@attr] Absolute Path Step 1 Predicate Separator Step 2
- 11. Nodes â—Ź node() â—Ź * or qualified-name â—Ź text() â—Ź comment() â—Ź processing-instruction()
- 12. Axes â—Ź axis::... â—Ź Full syntax â—Ź Short Syntax â—Ź Default Axis
- 13. child <barcamps> <barcamptitle="PHP Unconference Hamburg" id="phpuchh"> <link href="http://www.php-unconference.de/" /> </barcamp> <barcamp title="PHP Barcamp Salzburg" id="phpbcat"> <link href="http://www.phpbarcamp.at/cms/" /> <speakers-featured> <speaker>Bastian Feder</speaker> </speakers-featured> <speakers> <speaker>Thomas Weinert</speaker> </speakers> </barcamp> <barcamp title="PHP Unconference Europe" id="phpuceu"> <link href="http://www.phpuceu.org/"> </barcamp> </barcamps>
- 14. descendant <barcamps> <barcamptitle="PHP Unconference Hamburg" id="phpuchh"> <link href="http://www.php-unconference.de/" /> </barcamp> <barcamp title="PHP Barcamp Salzburg" id="phpbcat"> <link href="http://www.phpbarcamp.at/cms/" /> <speakers-featured> <speaker>Bastian Feder</speaker> </speakers-featured> <speakers> <speaker>Thomas Weinert</speaker> </speakers> </barcamp> <barcamp title="PHP Unconference Europe" id="phpuceu"> <link href="http://www.phpuceu.org/"> </barcamp> </barcamps>
- 15. parent <barcamps> <barcamptitle="PHP Unconference Hamburg" id="phpuchh"> <link href="http://www.php-unconference.de/" /> </barcamp> <barcamp title="PHP Barcamp Salzburg" id="phpbcat"> <link href="http://www.phpbarcamp.at/cms/" /> <speakers-featured> <speaker>Bastian Feder</speaker> </speakers-featured> <speakers> <speaker>Thomas Weinert</speaker> </speakers> </barcamp> <barcamp title="PHP Unconference Europe" id="phpuceu"> <link href="http://www.phpuceu.org/"> </barcamp> </barcamps>
- 16. following-sibling <barcamps> <barcamptitle="PHP Unconference Hamburg" id="phpuchh"> <link href="http://www.php-unconference.de/" /> </barcamp> <barcamp title="PHP Barcamp Salzburg" id="phpbcat"> <link href="http://www.phpbarcamp.at/cms/" /> <speakers-featured> <speaker>Bastian Feder</speaker> </speakers-featured> <speakers> <speaker>Thomas Weinert</speaker> </speakers> </barcamp> <barcamp title="PHP Unconference Europe" id="phpuceu"> <link href="http://www.phpuceu.org/"> </barcamp> </barcamps>
- 17. More Axes â—Ź ancestor â—Ź attribute â—Ź ancestor-or-self â—Ź namespaces â—Ź descendant-or-self â—Ź following â—Ź preceding â—Ź preceding-sibling â—Ź self
- 18. Short Syntax â—Ź self::node()/ descendant-or-self::node()/ child::para â—Ź .//para Axis Short child self . parent .. attribute @ descendant-or-self /
- 19. Cast Functions â—Ź string() â—Ź number() â—Ź boolean() echo $xpath->evaluate('string(/html/head/title)');
- 20. Node Functions â—Ź count() â—Ź name() â—Ź last() â—Ź local-name() â—Ź position() â—Ź namespace-uri() $list = $xpath->evaluate( '//*[local-name() = 'li' and position() = last()]' );
- 21. String Functions â—Ź concat() â—Ź normalize-string() â—Ź starts-with() â—Ź translate() â—Ź contains() â—Ź substring-before() â—Ź substring-after() â—Ź substring() â—Ź string-length()
- 22. Match A Class â—Ź normalize-string() â—Ź concat() â—Ź contains()
- 23. Namespaces â—Ź URN â—Ź Prefix â—Ź Default Namespace â—Ź Own Prefixes â—Ź Attributes
- 24. Bug #49490 â—Ź Namespace prefix conflict $dom = new DOMDocument(); $dom->loadXML( '<foobar><a:foo xmlns:a="urn:a">'. '<b:bar xmlns:b="urn:b"/></a:foo>'. '</foobar>' ); $xpath = new DOMXPath($dom); $context = $dom->documentElement->firstChild; $xpath->registerNamespace('a', 'urn:b'); var_dump( $xpath->evaluate('descendant-or-self::a:*', $context) ->item(0)->tagName );
- 25. Tools â—Ź Firebug â—Ź Firefox AddOns
- 26. CSS Selectors â—Ź JavaScript libraries â—Ź element nodes â—Ź * â—Ź no axes â—Ź descendant-or-self::* â—Ź can ignore namespaces â—Ź descendant-or-self::*[local-name() = '...']
- 27. Thanks â—Ź Web: â—Ź http://www.papaya-cms.com/ â—Ź http://www.a-basketful-of-papayas.net/ â—Ź Twitter â—Ź @ThomasWeinert â—Ź Joind.in â—Ź http://joind.in/1621