OWL Reader :: read（）错误

Question

我试图将我的搜索变量发送到本体，并查看它是否属于任何类或子类作为其属性。我怎样才能做到这一点？

 <?php 
        $search=$_GET['searchtext'];

        if(empty($search)){
            echo ("You don't enter anything.");
    }
    else{
          echo ("String you enter is " . $search . " !");
    }


        require_once "owllib/OWLLib.php";
        require_once "$OWLLIB_ROOT/reader/OWLReader.php";
        require_once "$OWLLIB_ROOT/memory/OWLMemoryOntology.php";

        $reader = new OWLReader();
        $ontology = new OWLMemoryOntology();
        $reader->read($filename, $ontology);
        $class = $ontology->getClass($search); 

        echo("Ontology output is " .$class);


    ?>