Using Limit and offset in a SPARQL query with PHP

gistfile1.php

<?php

$myQuery = "select * where{?x ?y ?z}";

$result = getFromEndpoint(urlencode($myQuery), 10, 10);

if($result != null){
        print_r($result);
}

function getFromEndpoint($query, $limit, $offset){
        $f = file_get_contents("http://cu.gene.bio2rdf.org/sparql?default-graph-uri=&query=".$query."+limit+".$limit."+offset+".$offset."&format=xml%2Fhtml&timeout=0");
        if($f != null && strlen($f)>0){
                return $f;
        }else{
                return null;
        }
}
?>