php - Yii DropdownList prompt -

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i have dropdownlist, doesnt take prompt or empty default value, takes last value of $list, why can be? 

        $models = zfinfraestructuras::model()->findall(array('order' => 'infraestructura_nombre'));         $list = chtml::listdata($models,                  'infraestructura_id', 'infraestructura_nombre');          echo chtml::dropdownlist('infraestructuras', $models,                $list,               array('prompt' => 'selecciona infraestructura'));     ?> </div> 

public static string dropdownlist(string $name, string $select, array $data, array $htmloptions=array ( ))

check select parameter

http://yiiapi.com/chtml#dropdownlist-detail


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