yii2的SQL语句，对提交来的数据，默认是转义的吗。 [ 新手入门 ]

85 Query	SELECT EXISTS(SELECT * FROM `account` WHERE `name`='3333\' --')
85 Query	SELECT EXISTS(SELECT * FROM `account` WHERE `name`='3333\' --')
85 Quit	
180418  0:46:07	   86 Connect	root@localhost on cq1
86 Query	SET NAMES 'utf8'
86 Query	SELECT EXISTS(SELECT * FROM `account` WHERE `name`='\'; drop teble a')
86 Query	SELECT EXISTS(SELECT * FROM `account` WHERE `name`='\'; drop teble a')
               

如果是已经过滤转义的了
那么

[['username', 'email'], 'filter', 'filter' => 'trim', 'skipOnArray' => true];

再加这个规则有啥意义