public function get_css_tree_post_processor() {
        $configs = [$this] + $this->parent_configs;
        foreach ($configs as $config) {
            if (!empty($config->csstreepostprocessor) && is_callable($config->csstreepostprocessor)) {
                return $config->csstreepostprocessor;
            }
        }
        return null;
    }
public function get_css_tree_post_processor() {
        $configs = [$this] + $this->parent_configs;
        foreach ($configs as $config) {
            if (!empty($config->csstreepostprocessor) && is_callable($config->csstreepostprocessor)) {
                return $config->csstreepostprocessor;
            }
        }
        return null;
    }
public function get_css_tree_post_processor ( ) { $ configs = [ $ this ] + $ this -> parent_configs ; foreach ( $ configs as $ config ) { if ( ! empty ( $ config -> csstreepostprocessor ) && is_callable ( $ config -> csstreepostprocessor ) ) { return $ config -> csstreepostprocessor ; } } return null ; }
Get the callable for CSS tree post processing.

@return string|null
Get the callable for CSS tree post processing .