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| <?php | |
| /** | |
| * Making a SPARQL SELECT query | |
| * | |
| * This example creates a new SPARQL client, pointing at the | |
| * dbpedia.org endpoint. It then makes a SELECT query that | |
| * returns all of the countries in DBpedia along with an | |
| * english label. | |
| * | |
| * Note how the namespace prefix declarations are automatically | |
| * added to the query. | |
| * | |
| * @package EasyRdf | |
| * @copyright Copyright (c) 2009-2020 Nicholas J Humfrey | |
| * @license http://unlicense.org/ | |
| */ | |
| require_once realpath(__DIR__.'/..')."/vendor/autoload.php"; | |
| require_once __DIR__."/html_tag_helpers.php"; | |
| // Setup some additional prefixes for DBpedia | |
| \EasyRdf\RdfNamespace::set('dbc', 'http://dbpedia.org/resource/Category:'); | |
| \EasyRdf\RdfNamespace::set('dbpedia', 'http://dbpedia.org/resource/'); | |
| \EasyRdf\RdfNamespace::set('dbo', 'http://dbpedia.org/ontology/'); | |
| \EasyRdf\RdfNamespace::set('dbp', 'http://dbpedia.org/property/'); | |
| $sparql = new \EasyRdf\Sparql\Client('http://dbpedia.org/sparql'); | |
| ?> | |
| <html> | |
| <head> | |
| <title>EasyRdf Basic Sparql Example</title> | |
| <meta http-equiv="content-type" content="text/html; charset=utf-8" /> | |
| </head> | |
| <body> | |
| <h1>EasyRdf Basic Sparql Example</h1> | |
| <h2>List of countries</h2> | |
| <ul> | |
| <?php | |
| $result = $sparql->query( | |
| 'SELECT * WHERE {'. | |
| ' ?country rdf:type dbo:Country .'. | |
| ' ?country rdfs:label ?label .'. | |
| ' ?country dct:subject dbc:Member_states_of_the_United_Nations .'. | |
| ' FILTER ( lang(?label) = "en" )'. | |
| '} ORDER BY ?label' | |
| ); | |
| foreach ($result as $row) { | |
| echo "<li>".link_to($row->label, $row->country)."</li>\n"; | |
| } | |
| ?> | |
| </ul> | |
| <p>Total number of countries: <?= $result->numRows() ?></p> | |
| </body> | |
| </html> |