优化CRUD代码

application/admin/command/Crud/stubs/mixins/multiple.stub

@@ -1,7 +1,7 @@
 
     public function {%methodName%}($value, $data)
     {
-        $value = $value ? $value : (isset($data['{%field%}']) ? $data['{%field%}'] : '');
+        $value = $value ?: ($data['{%field%}'] ?? '');
         $valueArr = explode(',', $value);
         $list = $this->{%listMethodName%}();
         return implode(',', array_intersect_key($list, array_flip($valueArr)));