Form/Type/DynamicFormType.php
private function getItemWidthNumber($width)
    {
        switch ($width) {
            case 'one-sixth':
                $itemWidth = 2;
                break;
            case 'five-sixths':
                $itemWidth = 10;
                break;
            case 'one-quarter':
                $itemWidth = 3;
                break;
            case 'three-quarters':
                $itemWidth = 9;
                break;
            case 'one-third':
                $itemWidth = 4;
                break;
            case 'two-thirds':
                $itemWidth = 8;
                break;
            case 'half':
                $itemWidth = 6;
                break;
            case 'full':
                $itemWidth = 12;
                break;
            default:
                $itemWidth = 12;
        }

        return $itemWidth;
    }
private function getItemWidthNumber($width)
    {
        switch ($width) {
            case 'one-sixth':
                $itemWidth = 2;
                break;
            case 'five-sixths':
                $itemWidth = 10;
                break;
            case 'one-quarter':
                $itemWidth = 3;
                break;
            case 'three-quarters':
                $itemWidth = 9;
                break;
            case 'one-third':
                $itemWidth = 4;
                break;
            case 'two-thirds':
                $itemWidth = 8;
                break;
            case 'half':
                $itemWidth = 6;
                break;
            case 'full':
                $itemWidth = 12;
                break;
            default:
                $itemWidth = 12;
        }

        return $itemWidth;
    }
Get item width number.

@param string $width

@return int