<?php
// retrieving a (well-known) person's birthdate from DBPedia

require_once ('decoDate.php.txt');

function makeHTTPQuery($pers){
    $format = 'xml';
    $query =
    "PREFIX dbp: <http://dbpedia.org/resource/> 
     PREFIX ont: <http://dbpedia.org/ontology/>
     SELECT ?bd
     WHERE {
         dbp:$pers ont:birthDate ?bd
     }";
   
    $endpoint = 'http://dbpedia.org/sparql';
    $searchUrl = $endpoint.'?'.'query='.urlencode($query).'&format='.$format;
    return $searchUrl;
}//makeHTTPQuery

function sendQuery($searchUrl){
    // get curl handle
    $ch = curl_init();
    // set request url
    curl_setopt($ch, CURLOPT_URL, $searchUrl);
    // set option "return response", don't print/echo
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    // get the response
    $response = curl_exec($ch);
    curl_close($ch);
    return $response;
}//sendQuery

function extractDate ($xmlString){
    $splDoc = new SimpleXMLElement($xmlString);
    $splDoc->registerXPathNamespace('s', 'http://www.w3.org/2005/sparql-results#');
    $pathb = "/s:sparql/s:results/s:result/s:binding[@name='bd']/s:literal/text()";
    $bds = $splDoc->xpath($pathb); // array
    return $bds[0];
}//extractDate

$first = $argv[1];
$last = $argv[2];
$person = $first.'_'.$last;
//echo "$person\n";
//$query = makeHTTPQuery ($person);
//echo "$query\n";
//$resp = sendQuery($query);
//echo $resp."\n";
echo "$first $last was born on ".decoDate (extractDate (sendQuery ( makeHTTPQuery ($person))))."\n";