foreach ($tabs_elements as $i => $tabs_content) {
            $crawler = new Crawler($tabs_content);

            foreach ($crawler->filter('div') as $i => $div_content) {
                $crawler = new Crawler($div_content);

                foreach ($crawler->filter('div > a') as $i => $a_content) {
                    $a[] = $a_content->nodeValue;

                    $crawler = new Crawler($a_content);
                    $link = $crawler->filter('a')->attr('href');

                    array_push($a, $link);
                }
                $div[]=$a;
            }
            $rows[] = $div;
        }

правильный вариант
                foreach ($crawler->filter('div > a') as $i => $a_content) {
                    $a = array();
                    $a[] = $a_content->nodeValue;

                    $crawler = new Crawler($a_content);
                    $link = $crawler->filter('a')->attr('href');

                    array_push($a, $link);

                    $div[]=$a;
                }