Unable to retrieve a value after a PRAGMA statment using sqlite3

I’m trying to learn to use php interacting with db.
To connect to sqlite3 I’m using the ADOdb library.
This is the PHP snippet I’m using.

require_once 'ADOdb/adodb.inc.php';

$db = NewADOConnection('sqlite3');

$databasePath = 'test.db';

$db->Connect($databasePath);

$query = $_GET['table'];
$result = $db->Execute($query);
echo $result;
?> 

Using this script I’m able to run queries without any problem, but until I try to run a query like this,
PRAGMA table_info('test');SELECT 1;,
I’m unable to retrieve the value of the second query. Could anyone tell me why? Thanks in advance.