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Initially the parameter of the select is empty? - code-flow.club | Q&A

Initially the parameter of the select is empty?


Warning: count(): Parameter must be an array or an object that implements Countable in /home/styllloz/public_html/qa-theme/donut-theme/qa-donut-layer.php on line 274
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Use search Model to search for. Not to write a category for search did this.

<?= $form->field($model, 'category_id')->dropDownList(ArrayHelper::map(Category::find()->all(), 'id','name'),['style'=>'font-family: \\'Exo 2\\', sans-serif; color: #0f0f0f; font-size:17px'])->label('Department')?>


But the point is, always list the first branch is active. T e, it will search according to this parameter. But how to do so initially the option was not there?
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<?= $form->field($model, 'category_id')->dropDownList([" => 'please choose Department'] + ArrayHelper::map(Category::find()->all(), 'id','name'),['style'=>'font-family: \\'Exo 2\\', sans-serif; color: #0f0f0f; font-size:17px'])->label('Department')?>
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