# 模型 >[info] 模型除了支持db方法外，還增加許多針對性功能，返回數據集，支持更多數據處理功能，比如結果過濾，增加新字段，數據自動完成，轉換，多表關聯等 1. 如表 test如下 | id|name | | --- | --- | | 1 | one | | 2 | two | | 3 | three | >[info] 模型名稱 為*TestModel.php* 2. 過濾 >[info]找出等于1，3的記錄 ``` TestModel::select()->filter(function($item){ return in_array($item['id'],[1,3]); }); //結果如下 array(2) { [0] => array(2) { ["id"] => int(1) ["name"] => string(3) "one" } [2] => array(2) { ["id"] => int(3) ["name"] => string(5) "three" } } ``` 3. 臨時增加一個字段 >[info]增加字段 title ,等于id+name ``` TestModel::select()->append(['title'])->withAttr('title',function($val,$item){ return $item['id'].'-'.$item['name']; }); //結果如下 array(3) { [0] => array(3) { ["id"] => int(1) ["name"] => string(3) "one" ["title"] => string(5) "1-one" } [1] => array(3) { ["id"] => int(2) ["name"] => string(3) "two" ["title"] => string(5) "2-two" } [2] => array(3) { ["id"] => int(3) ["name"] => string(5) "three" ["title"] => string(7) "3-three" } } ```