fix

common/models/psources/ExploreApp.php

@@ -32,6 +32,7 @@ class ExploreApp extends BaseActiveRecord
         return [
             [['name', 'icon', 'app_url', 'slogan', 'type', 'sort', 'status', 'platform_id', 'app_category_id'], 'required'],
             [['type', 'sort', 'status', 'platform_id', 'app_category_id'], 'integer'],
+            ['slogan', 'length', 'max'=> 50],
             [['icon'], 'url']
         ];
     }