yii - how to generating a dropdown list in yii2 -


I tried to create a dropdown list in yii2 using this link:

My code is : 

  & lt ;? Php use yii \ helpers \ ArrayHelper; Use the app \ model \ product; ? & Gt; & Lt ;? = $ Listdata = ArrayHelper :: Map (Product :: Search () - & gt; All (), 'id', 'name'); ? & Gt; & Lt ;? = $ Form-> Field ($ model, 'parent_id') - & gt; DropDownList ($ listdata); ? & Gt;

But I have a problem using ArrayHelper - The problem is: PHP Notices - yii \ base \ errorException Array for conversion string < / Strong> .......! I have tested the code below: 

  $ listData = ArrayHelper :: map (Product :: Search () -> asArray () - & gt; all (), 'id' , 'Name');

But this is not the solution and there is only one error!

What is the problem? Can anyone help me?

Are you trying to resize an array, and ? = & lt ;? Php In: 

  & lt ;? = $ Listdata = ArrayHelper :: Map (Products :: Search () - & gt; All (), 'id', 'name'); ? & Gt;

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