[Rdfapi-php-interest] RdfAPI.php doesn't work for me.

When I try with a very easy file:

<?php
// Include RAP
define("RDFAPI_INCLUDE_DIR",
"C:/Users/portatil/Desktop/PROYECTO/rdfapi-php/api/");
include(RDFAPI_INCLUDE_DIR . "RdfAPI.php");

// Filename of an RDF document
$base="example1.rdf";

// Create a new MemModel
$model = ModelFactory::getDefaultModel();

// Load and parse document
$model->load($base);

// Output model as HTML table
$model->writeAsHtmlTable();
?>


I receive the following output:
load($base); // Output model as HTML table $model->writeAsHtmlTable(); ?> 


And I don't understand what happen, could someone help me?

P.S. Excuse my English,please, I'm a beginner.