Pressbooks\Modules\Import\WordPress\Wxr::pbCheck PHP Метод

    protected function pbCheck(array $xml)
    {
        $pt = $ch = $fm = $bm = $meta = 0;
        foreach ($xml['posts'] as $p) {
            if ('part' == $p['post_type']) {
                $pt = 1;
            } elseif ('chapter' == $p['post_type']) {
                $ch = 1;
            } elseif ('front-matter' == $p['post_type']) {
                $fm = 1;
            } elseif ('back-matter' == $p['post_type']) {
                $bm = 1;
            } elseif ('metadata' == $p['post_type']) {
                $meta = 1;
            }
            if ($pt + $ch + $fm + $bm + $meta >= 2) {
                $this->isPbWxr = true;
                break;
            }
        }
    }