Souke/console/migrations/m161219_135239_champs_facture_periode.php

<?php

use yii\db\Migration;
use yii\db\Schema;

class m161219_135239_champs_facture_periode extends Migration
{
    public function up()
    {
        $this->addColumn('facture', 'periode', Schema::TYPE_STRING) ;
    }

    public function down()
    {
        $this->dropColumn('facture', 'periode') ;
    }
}