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                只讀字段用來保護某些特殊的字段值不被更改,這個字段的值一旦寫入,就無法更改。 要使用只讀字段的功能,我們只需要在模型中定義`readonly`屬性: ~~~ namespace app\index\model; use think\Model; class User extends Model { protected $readonly = ['name','email']; } ~~~ 例如,上面定義了當前模型的`name`和`email`字段為只讀字段,不允許被更改。也就是說當執行更新方法之前會自動過濾掉只讀字段的值,避免更新到數據庫。 下面舉個例子說明下: ~~~ $user = User::get(5); // 更改某些字段的值 $user->name = 'TOPThink'; $user->email = 'Topthink@gmail.com'; $user->address = '上海靜安區'; // 保存更改后的用戶數據 $user->save(); ~~~ 事實上,由于我們對`name`和`email`字段設置了只讀,因此只有`address`字段的值被更新了,而`name`和`email`的值仍然還是更新之前的值。
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