不知道该怎么把res 里面的值显示出来？求助~

Question

function siy_user_ddtime(){$user_id = !empty($atts['id']) ? intval($atts['id']) : ($_SESSION['user_id'] > 0 ? $_SESSION['user_id'] : 0);$sql = "SELECT add_time" ." FROM " .$GLOBALS['ecs']->table('order_info')." WHERE user_id = '$user_id' ";$res = $GLOBALS['db']->SelectLimit($sql, 1, 0);return $res;}求 基本的 php 查询实列查询namefunction siy_user_ddtime()｛return $name;｝ 就可以了

Answer 1

function siy_user_name()
{
$user_id = !empty($atts['id']) ? intval($atts['id']) : ($_SESSION['user_id'] > 0 ? $_SESSION['user_id'] : 0);
$sql = "SELECT user_name " ." FROM " .$GLOBALS['ecs']->table('order_info')." WHERE user_id = '$user_id' ";
$res = $GLOBALS['db']->SelectLimit($sql, 1, 0);
return $res;
}

Answer 2

$arr = array();
$sql = 'select * from table"
$res = mysql_query($sql)
while($row = mysql_fetch_array($res))
{
$arr[] = $row;
}
return $arr;

Answer 3

$aa = siy_user_ddtime();
echo $aa;