Redland in PHP / Ubuntu

The PHP docs are a little lacking; so...

Install in Ubuntu: apt-get install php5-librdf

roll: great, the redland php bindings are also in darwin ports. just $port install redland-bindings +php5. time to integrate it in my project :)

Checking its installed:

clockwerx@clockwerx-desktop:~$ php -i | grep rdf
redland librdf version => 1.0.9

How do you use it? Here's a port of example1.c

<?php
$world=librdf_new_world();
librdf_world_open($world);

$uri=librdf_new_uri($world, "http://librdf.org/bindings/bindings.rdf");
if(!$uri) {
    die("Failed to create URI\n");
}

$storage=librdf_new_storage($world, "memory", "test", NULL);
if(!$storage) {
    die("Failed to create new storage\n");
}

$model=librdf_new_model($world, $storage, NULL);
if(!$model) {
    die("Failed to create model\n");
}

$parser_name = "";
$parser = librdf_new_parser($world, $parser_name, NULL, NULL);

if(!$parser) {
    die("Failed to create new parser\n");
}

function librdf_uri_as_string($uri) {
    return (string)$uri;
}

print "Parsing URI " . librdf_uri_as_string($uri) . "\n";
if(librdf_parser_parse_into_model($parser, $uri, $uri, $model)) {
    die("Failed to parse RDF into model\n");
    return(1);
}
librdf_free_parser($parser);


$statement2 = librdf_new_statement_from_nodes($world, librdf_new_node_from_uri_string($world, "http://www.dajobe.org/"),
                                             librdf_new_node_from_uri_string($world, "http://purl.org/dc/elements/1.1/title"),
                                             librdf_new_node_from_literal($world, "My Home Page", NULL, 0)
                                             );
librdf_model_add_statement($model, $statement2);

/* Free what we just used to add to the model - now it should be stored */
librdf_free_statement($statement2);


  /* Print out the model*/

  print "Resulting model is:\n";
  print librdf_model_to_string($model, $uri, "");

  /* Construct the query predicate (arc) and object (target) 
   * and partial statement bits
   */
  $subject=librdf_new_node_from_uri_string($world, "http://www.dajobe.org/");
  $predicate=librdf_new_node_from_uri_string($world, "http://purl.org/dc/elements/1.1/title");
  if(!$subject || !$predicate) {
    die("Failed to create nodes for searching\n");
  }
  $partial_statement=librdf_new_statement($world);
  librdf_statement_set_subject($partial_statement, $subject);
  librdf_statement_set_predicate($partial_statement, $predicate);


  /* QUERY TEST 1 - use find_statements to match */

  print "Trying to find_statements\n";
  $stream=librdf_model_find_statements($model, $partial_statement);
  if(!$stream) {
    die("librdf_model_find_statements returned NULL stream\n");
  } else {
    $count=0;
    while(!librdf_stream_end($stream)) {
      $statement=librdf_stream_get_object($stream);
      if(!$statement) {
        die("librdf_stream_next returned NULL\n");
        break;
      }
      
      echo("  Matched statement: ");
      print  librdf_statement_to_string($statement);
      print "\n";
      
      librdf_stream_next($stream);
      $count++;
    }
    librdf_free_stream($stream);  
    print "got " . $count . " matching statements\n";
  }


  /* QUERY TEST 2 - use get_targets to do match */
  print "Trying to get targets\n";
  $iterator=librdf_model_get_targets($model, $subject, $predicate);
if(!$iterator)  {
    die("librdf_model_get_targets failed to return iterator for searching\n");
}

$count=0;
while(!librdf_iterator_end($iterator)) {

    $target=librdf_iterator_get_object($iterator);
    if(!$target) {
      die("librdf_iterator_get_object returned NULL\n");
    }

    print "  Matched target: ";
print librdf_node_to_string($target);
    print "
";

    $count++;
    librdf_iterator_next($iterator);
}
librdf_free_iterator($iterator);
printf("got %d target nodes\n", $count);

librdf_free_statement($partial_statement);
/* the above does this since they are still attached */
/* librdf_free_node(predicate); */
/* librdf_free_node(object); */

librdf_free_model($model);

librdf_free_storage($storage);

librdf_free_uri($uri);

librdf_free_world($world);