菜鸟，json输出

foreach ($query->result_array() as $row)   {	$data = array(		'id' =>  $row['id'],		'title' =>$row['title']	);   }echo json_encode($data);

前端为何只输了一组数据？
CI框架
({"id":"2","title":"\u65b0\u7586VS\u5317\u4eac"})

回复讨论(解决方案)

foreach ($query->result_array() as $row)
{
$data[] = array(
'id' => $row['id'],
'title' =>$row['title']
);
}

foreach ($query->result_array() as $row)
{
$data[] = array(
'id' => $row['id'],
'title' =>$row['title']
);
}

多谢！