PHP/XML/xpath

Combine it with an XPath search

   <source lang="html4strict">

<?

   $xml = simplexml_load_file("employees.xml");
   echo $xml->asXML( );
   $xml->employee[1]->age = 55;
   $employees = $xml->xpath("/employees/employee[name="A"]");
   $employees[0]->title = "Officer";
   echo $xml->asXML( );

?>

 </source>
   
  

Searching and Filtering with XPath

   <source lang="html4strict">

<?

   $xml = simplexml_load_file("employees.xml");
   $names = $xml->xpath("/employees/employee/name");
   foreach($names as $name) {
           echo "Found $name
";
   }
   echo "
";
   $employees = $xml->xpath("/employees/employee");
   foreach($employees as $employee) {
           echo "Found {$employee->name}
";
   }
   $names = $xml->xpath("//name");
   foreach($names as $name) {
           echo "Found $name
";
   }

?>

 </source>
   
  

Using XPath and DOM

   <source lang="html4strict">

$dom = new DOMDocument; $dom->load("address-book.xml"); $xpath = new DOMXPath($dom); $email = $xpath->query("/address-book/person/email"); // <?xml version="1.0"?> <address-book>

   <person id="1">
       <firstname>D</firstname>
       <lastname>S</lastname>
       <city>New York</city>
       <state>NY</state>
       <email>s@php.net</email>
   </person>
   <person id="2">
       <firstname>A</firstname>
       <lastname>T</lastname>
       <city>San Francisco</city>
       <state>CA</state>
       <email>a@php.net</email>
   </person>

</address-book>

 </source>
   
  

Using XPath and SimpleXML in a basic example

   <source lang="html4strict">

<? $s = simplexml_load_file("address-book.xml"); $emails = $s->xpath("/address-book/person/email"); foreach ($emails as $email) {

   // do something with $email

} ?> // <?xml version="1.0"?> <address-book>

   <person id="1">
       <firstname>D</firstname>
       <lastname>S</lastname>
       <city>New York</city>
       <state>NY</state>
       <email>s@php.net</email>
   </person>
   <person id="2">
       <firstname>A</firstname>
       <lastname>T</lastname>
       <city>San Francisco</city>
       <state>CA</state>
       <email>a@php.net</email>
   </person>

</address-book>

 </source>
   
  

Using XPath with DOM in a basic example

   <source lang="html4strict">

<? $dom = new DOMDocument; $dom->load("address-book.xml"); $xpath = new DOMXPath($dom); $emails = $xpath->query("/address-book/person/email"); foreach ($emails as $e) {

   $email = $e->firstChild->nodeValue;
   // do something with $email

} ?> // <?xml version="1.0"?> <address-book>

   <person id="1">
       <firstname>D</firstname>
       <lastname>S</lastname>
       <city>New York</city>
       <state>NY</state>
       <email>s@php.net</email>
   </person>
   <person id="2">
       <firstname>A</firstname>
       <lastname>T</lastname>
       <city>San Francisco</city>
       <state>CA</state>
       <email>a@php.net</email>
   </person>

</address-book>

 </source>
   
  

Using XPath with SimpleXML in a more complicated example

   <source lang="html4strict">

<? $s = simplexml_load_file("address-book.xml"); $people = $s->xpath("/address-book/person"); foreach($people as $p) {

   list($firstname) = $p->xpath("firstname");
   list($lastname) = $p->xpath("lastname");
   
   print "$firstname $lastname\n";

} ?> // <?xml version="1.0"?> <address-book>

   <person id="1">
       <firstname>D</firstname>
       <lastname>S</lastname>
       <city>New York</city>
       <state>NY</state>
       <email>s@php.net</email>
   </person>
   <person id="2">
       <firstname>A</firstname>
       <lastname>T</lastname>
       <city>San Francisco</city>
       <state>CA</state>
       <email>a@php.net</email>
   </person>

</address-book>

 </source>
   
  

XPath can be used to filter your results according to any values

   <source lang="html4strict">

<?

   $xml = simplexml_load_file("employees.xml");
   $employees = $xml->xpath("/employees/employee[name="Laura Pollard"]");
   foreach($employees as $employee) {
           echo "Found {$employee->name}
";
   }
   $employees = $xml->xpath("/employees/employee[age<54]");
   foreach($employees as $employee) {
           echo "Found {$employee->name}
";
   }
   $employees = $xml->xpath("//employee[age>=48]");
   foreach($employees as $employee) {
           echo "Found {$employee->name}
";
   }

?>

 </source>
   
  

XPath DOM Query

   <source lang="html4strict">

<html> <head>

<title>XPath DOM Query</title>

</head> <body>

<?php $dom = new DomDocument(); $dom -> load( "food.xml" ); $xp = new DomXPath( $dom ); $fruits = $xp -> query( "/food/fruit/item" ); foreach($fruits as $node) {

echo( "

" . $node -> textContent . "

" );

} echo( "</ul>" ); ?> </body> </html>

 </source>
   
  

xpath.php

   <source lang="html4strict">

<?php

  $xml = simplexml_load_file("books.xml");
  $authors = $xml->xpath("/library/book/author");
  foreach($authors AS $author) {
     echo "$author
";
  }

?>

 </source>