ADOdb: How to show fields

<?php 
    include('adodb/adodb.inc.php'); 
    $db = ADONewConnection('mysql'); 
    $db->debug = true; 
    $db->Connect('localhost', 'root', 'admin', 'scanner'); 
	$arr = $db->MetaColumns('name_table'); 
	echo "<pre>";
	print_r($arr);
	echo "</pre>";
?>