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easyrdf/examples/wikidata_villages.php

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<?php
/**
* Consuming Linked Data from Wikidata.
*
* This example demonstrates fetching information about villages in Fife
* from Wikidata. The list of villages is fetched by running a SPARQL query.
*
* If you click on an village, then it fetched by getting the Turtle formatted
* RDF from Wikidata for that village. It then parses the result and
* displays a page about that village with a title, synopsis and Open Street Map.
*
* @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 Wikidata
\EasyRdf\RdfNamespace::set('wd', 'http://www.wikidata.org/entity/');
\EasyRdf\RdfNamespace::set('wds', 'http://www.wikidata.org/entity/statement/');
\EasyRdf\RdfNamespace::set('wdt', 'http://www.wikidata.org/prop/direct/');
\EasyRdf\RdfNamespace::set('p', 'http://www.wikidata.org/prop/');
\EasyRdf\RdfNamespace::set('wikibase', 'http://wikiba.se/ontology#');
// SPARQL Query to get a list of villages in Fife
$SPARQL_QUERY = '
SELECT ?item ?itemLabel
WHERE {
?item wdt:P31 wd:Q532 . # Instance of Village
?item wdt:P131 wd:Q201149 . # Located in Fife
SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
}
ORDER BY ?itemLabel
';
$SPARQL_ENDPOINT = 'https://query.wikidata.org/sparql';
$WIKIDATA_IMAGE = 'wdt:P18';
$WIKIDATA_POINT = 'wdt:P625';
?>
<html>
<head><title>EasyRdf Village Info Example</title></head>
<body>
<h1>EasyRdf Village Info Example</h1>
<?php
if (isset($_REQUEST['id'])) {
$id = $_REQUEST['id'];
$graph = \EasyRdf\Graph::newAndLoad("wd:$id", 'turtle');
$village = $graph->resource("wd:$id");
if ($village->get($WIKIDATA_IMAGE)) {
print image_tag(
$village->get($WIKIDATA_IMAGE),
array('style'=>'max-width:400px;max-height:250px;margin:10px;float:right')
);
}
print content_tag('h2',$village->label('en'));
print content_tag('p', $village->get('schema:description', null, 'en'));
if (preg_match("/Point\((\S+) (\S+)\)/", $village->get($WIKIDATA_POINT), $matches)) {
$long = $matches[1];
$lat = $matches[2];
print "<iframe width='420' height='350' frameborder='0' scrolling='no' marginheight='0' marginwidth='0' src='http://www.openlinkmap.org/small.php?lat=$lat&lon=$long&zoom=14' style='border: 1px solid black'></iframe>";
}
print content_tag('h3', "Pages about " . $village->label('en'));
print "<ul>\n";
foreach ($graph->all($village, "^schema:about") as $doc) {
print '<li>'.link_to($doc)."</li>\n";
}
print "</ul>\n";
echo "<br /><br />";
echo $village->dump();
} else {
print "<p>List of villages in Fife.</p>";
$sparql = new \EasyRdf\Sparql\Client($SPARQL_ENDPOINT);
$results = $sparql->query($SPARQL_QUERY);
print "<ul>\n";
foreach ($results as $row) {
if (preg_match("|/(Q\d+)|", $row->item, $matches)) {
print '<li>'.link_to_self($row->itemLabel, "id=".$matches[1])."</li>\n";
}
}
print "</ul>\n";
}
?>
</body>
</html>