我在浏览器中会显示hello worldhello world。请问这是怎么回事？

<?php

require_once('function.php');

$controllerAllow=array('test','index');

$methodAllow=array('test','index','show');

$controller =in_array($_GET['controller'],$controllerAllow)?daddslashes($_GET['controller']):'index';

$method =in_array($_GET['method'],$methodAllow)?daddslashes($_GET['method']):'index';

C($controller,$method);

?>

<?php

class testController{

function show(){

$testModel = M('test');

$data = $testModel->get();

$testView = V('test');

$testView->display($data);

}

}

?>