DB_common::prepare()

<?php
// Once you have a valid DB object named $db...
$sth = $db->prepare('INSERT INTO numbers (number) VALUES (?)');
if (PEAR::isError($sth)) {
    die($sth->getMessage());
}

$res =& $db->execute($sth, 1);
if (PEAR::isError($res)) {
    die($res->getMessage());
}
?>