Заказать поле mysql

Question

Здравствуйте, я стажируюсь в компании в Бразилии, и мне нужно отсортировать это поле из таблицы, используя php codeigniter, но я не могу, потому что я очень новичок в программировании и даже больше в этой области. кто-нибудь может мне помочь?

Это модель, которую использует компания.

ps: извините за плохой engli sh и название переменных.

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Model_courses extends MY_Model {

    private $primary_key    = 'ID_course';
    private $table_name     = 'courses';
    private $field_search   = ['NAME_course', 'IMG_course'];

    public function __construct()
    {
        $config = array(
            'primary_key'   => $this->primary_key,
            'table_name'    => $this->table_name,
            'field_search'  => $this->field_search,
         );

         $ordem = sort($config.$field_search.$NAME_course);

        parent::__construct($config);
    }

    public function count_all($q = null, $field = null)
    {
        $iterasi = 1;
        $num = count($this->field_search);
        $where = NULL;
        $q = $this->scurity($q);
        $field = $this->scurity($field);

        if (empty($field)) {
            foreach ($this->field_search as $field) {
                if ($iterasi == 1) {
                    $where .= "courses.".$field . " LIKE '%" . $q . "%' ";
                } else {
                    $where .= "OR " . "courses.".$field . " LIKE '%" . $q . "%' ";
                }
                $iterasi++;
            }

            $where = '('.$where.')';
        } else {
            $where .= "(" . "courses.".$field . " LIKE '%" . $q . "%' )";
        }

        $this->join_avaiable()->filter_avaiable();
        $this->db->where($where);
        $query = $this->db->get($this->table_name);

        return $query->num_rows();
    }

    public function get($q = null, $field = null, $limit = 0, $offset = 0, $select_field = [])
    {
        $iterasi = 1;
        $num = count($this->field_search);
        $where = NULL;
        $q = $this->scurity($q);
        $field = $this->scurity($field);

        if (empty($field)) {
            foreach ($this->field_search as $field) {
                if ($iterasi == 1) {
                    $where .= "courses.".$field . " LIKE '%" . $q . "%' ";
                } else {
                    $where .= "OR " . "courses.".$field . " LIKE '%" . $q . "%' ";
                }
                $iterasi++;
            }

            $where = '('.$where.')';
        } else {
            $where .= "(" . "courses.".$field . " LIKE '%" . $q . "%' )";
        }

        if (is_array($select_field) AND count($select_field)) {
            $this->db->select($select_field);
        }

        $this->join_avaiable()->filter_avaiable();
        $this->db->where($where);
        $this->db->limit($limit, $offset);
        $this->db->order_by('courses.'.$this->primary_key, "DESC");
        $query = $this->db->get($this->table_name);

        return $query->result();
    }

    public function join_avaiable() {
        $this->db->join('category_courses', 'category_courses.ABBREVIATE = courses.CATEGORY', 'LEFT');
        $this->db->join('level_courses', 'level_courses.ID_LEVEL = courses.LEVEL', 'LEFT');

        return $this;
    }

    public function filter_avaiable() {

        return $this;
    }

}

/* End of file Model_courses.php */
/* Location: ./application/models/Model_courses.php */