如何在Codeigniter中将数组与结果合并？

Question

我在Codeigniter中有此代码，但是不知何故array_merge不想工作，如何将数组合并到结果中？

$categories = $this->get_categories();

    $data = array();

    foreach ($categories as $index) {
        $this->db->select('*');
        $this->db->from('questions');
        $this->db->where('category', $index);
        $this->db->order_by('id','RANDOM');
        $this->db->limit(3);
        $query = $this->db->get();

        array_merge_recursive($data, $query->result());


    }

    return $data;

Answer 1

您需要将array_merge_recursive()的结果保存到$data字符串中：

$data = array_merge_recursive($data, $query->result());