source: php/trunk/samples/rdfa_simple_api/sample.php

<?PHP

/* RDFInt.php - RDF Interfaces for PHP
 * Copyright 2011 netlabs.org
 * Author: Christian Langanke, Adrian Gschwend
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// load library setup
// load library setup
require_once( '../sample_config.php');
define( 'RDFINT', getenv( 'PHP_LIBROOT_RDFINT'));
require_once( RDFINT.'/rdfa.php');

$debugger = \fDebug::getInstance();
const debugcontext = "RDFA_SAMPLE";


$turtlefile = "sample.ttl";

// ---------------------------------------------------------------

$aNamespace = array( 'rdf'      => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
                     'foaf'     => 'http://xmlns.com/foaf/0.1/',
                     'resource' => 'http://data.uduvudu.org/resource/');

// parse file
$debugger->sendMessage( "Parsing file: $turtlefile", debugcontext);
$rdfaData = new \rdfa\Data();

// setup namespace mappings
foreach ( $aNamespace as $prefix => $uriNamespace) {
  $rdfaData->setMapping( $prefix, $uriNamespace);
}
$rdfaData->parse( $turtlefile);

// start using the data
$aUriPersons = $rdfaData->getSubjects( 'rdf:type', 'foaf:Person');
$debugmessage = count( $aUriPersons) . " persons found";
foreach ($aUriPersons as $uriPerson) {
  $debugmessage .= "\n$uriPerson";
}
$debugger->sendMessage( $debugmessage, debugcontext);


foreach ($aUriPersons as $uriPerson) {

  $debugger->sendMessage( "Retrieving name of person", debugcontext);
  $litName = $rdfaData->_getFirstValue( $uriPerson, 'foaf:name');

  // get triples of work blank node
  $debugger->sendMessage( "Filter for data of work", debugcontext);
  $aUriWork = $rdfaData->getValues( $uriPerson, 'foaf:work');

  $debugger->sendMessage( "Retrieving city of work", debugcontext);
  $litCity =  $rdfaData->_getFirstValue( $aUriWork[ 0], 'foaf:city');

  $debugger->sendMessage( "Data for person complete: $uriPerson\n".
                          "Name: $litName\n".
                          "City: $litCity", debugcontext);
}

?>