drop down menu - How to set pre-selected value in Yii2 Dropdownlist -


here set preselected value in yii2 dropdownlist,

this dropdownlist, how can set preselect value in 

<?= $form->field($model, 'tpa_email')->dropdownlist(                 arrayhelper::map(approvaldetails::find()->all(),'id','tpa_email'),                 ['prompt' => 'select tpa email..'])             ?>

becoz everytime while updating form , value getting reset.

the value of $model->tpa_email used select value list items. make sure $model->tpa_email contains key of value want have selected.


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