Yii2-保存数据库，获取最后添加的id

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1、You can get the last inserted ID like this:

Yii::app()->db->getLastInsertId();2、If $model->id wouldn't work then use Yii::app()->db->getLastInsertId() or getPrimaryKey()3、If your goal is to get the id that was assigned to the model that you just saved,   then after you do $model->save(), simply do $model->id to get it back. 4、you can also get the last inserted id of another model.
$std_id = Students::model()->findAll(array('order' => 'admission_no DESC','limit' => 1));            foreach($std_id as $f) {                echo  "Last Inserted Admission No:".$f['admission_no'];                }
or
you can last inserted id in the  same model
Yii::app()->db->getLastInsertID();
    
5、$model->primaryKey or$model->id // this is your primary key ite

6、In Yii2 last inserted id can be get using
Yii::$app->db->getLastInsertedID();
added for the people looking for the answer of same question in yii2

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