Carbon_Fields\Container\Post_Meta_Container::is_valid_save_conditions PHP Method

    public function is_valid_save_conditions($post_id)
    {
        $valid = true;
        $post = get_post($post_id);
        // Check post type
        if (!in_array($post->post_type, $this->settings['post_type'])) {
            return false;
        }
        // Check show on conditions
        foreach ($this->settings['show_on'] as $condition => $value) {
            if (is_null($value)) {
                continue;
            }
            switch ($condition) {
                // show_on_post_format
                case 'post_formats':
                    if (empty($value) || $post->post_type != 'post') {
                        break;
                    }
                    $current_format = get_post_format($post_id);
                    if (!in_array($current_format, $value)) {
                        $valid = false;
                        break 2;
                    }
                    break;
                    // show_on_taxonomy_term or show_on_category
                // show_on_taxonomy_term or show_on_category
                case 'category':
                    $this->show_on_category($value);
                    /* fall-through intended */
                /* fall-through intended */
                case 'tax_term_id':
                    $current_terms = wp_get_object_terms($post_id, $this->settings['show_on']['tax_slug'], array('fields' => 'ids'));
                    if (!is_array($current_terms) || !in_array($this->settings['show_on']['tax_term_id'], $current_terms)) {
                        $valid = false;
                        break 2;
                    }
                    break;
                    // show_on_level
                // show_on_level
                case 'level_limit':
                    $post_level = count(get_post_ancestors($post_id)) + 1;
                    if ($post_level != $value) {
                        $valid = false;
                        break 2;
                    }
                    break;
                    // show_on_page
                // show_on_page
                case 'page_id':
                    if ($post_id != $value) {
                        $valid = false;
                        break 2;
                    }
                    break;
                    // show_on_page_children
                // show_on_page_children
                case 'parent_page_id':
                    if ($post->post_parent != $value) {
                        $valid = false;
                        break 2;
                    }
                    break;
                    // show_on_template
                // show_on_template
                case 'template_names':
                    if (empty($value) || $post->post_type != 'page') {
                        break;
                    }
                    $current_template = get_post_meta($post_id, '_wp_page_template', 1);
                    if (!in_array($current_template, $value)) {
                        $valid = false;
                        break 2;
                    }
                    break;
                    // hide_on_template
                // hide_on_template
                case 'not_in_template_names':
                    if (empty($value) || $post->post_type != 'page') {
                        break;
                    }
                    $current_template = get_post_meta($post_id, '_wp_page_template', 1);
                    if (in_array($current_template, $value)) {
                        $valid = false;
                        break 2;
                    }
                    break;
            }
        }
        return $valid;
    }