yii\helpers\BaseHtml::removeCssClass PHP Метод

    public static function removeCssClass(&$options, $class)
    {
        if (isset($options['class'])) {
            if (is_array($options['class'])) {
                $classes = array_diff($options['class'], (array) $class);
                if (empty($classes)) {
                    unset($options['class']);
                } else {
                    $options['class'] = $classes;
                }
            } else {
                $classes = preg_split('/\\s+/', $options['class'], -1, PREG_SPLIT_NO_EMPTY);
                $classes = array_diff($classes, (array) $class);
                if (empty($classes)) {
                    unset($options['class']);
                } else {
                    $options['class'] = implode(' ', $classes);
                }
            }
        }
    }