php - The simplest cURL code won't execute script in the CURLOPT_URL option -

how can curl code more basic? yet can't output - hello curl! - on browser. please help!

<?php $ch = curl_init(); curl_setopt($ch, curlopt_url, "http://".$_server["http_host"]."/ita2/test.php"); curl_exec($ch); curl_close($ch); ?> 

this test.php script:

<?php echo "hello curl!"; ?>