Codeigniter 3 | set limit display records in foreach - php

Question

in view I can fetch all categories:
<?php foreach ($this->parent_categories as $category): ?>
<?php endforeach ?>
Now controller:
$data['parent_categories'] = $this->category_model->get_parent_categories_tree($category);
and finally model category:
//get parent categories tree
public function get_parent_categories_tree($category, $only_visible = true)
{
if (empty($category)) {
return array();
}
//get cached data
$key = "parent_categories_tree_all";
if ($only_visible == true) {
$key = "parent_categories_tree";
}
$key = $key . "_lang_" . $this->selected_lang->id;
$result_cache = get_cached_data($this, $key, "st");
if (!empty($result_cache)) {
if (!empty($result_cache[$category->id])) {
return $result_cache[$category->id];
}
} else {
$result_cache = array();
}
$parent_tree = $category->parent_tree;
$ids = array();
$str_sort = "";
if (!empty($parent_tree)) {
$array = explode(',', $parent_tree);
if (!empty($array)) {
foreach ($array as $item) {
array_push($ids, intval($item));
if ($str_sort == "") {
$str_sort = intval($item);
} else {
$str_sort .= "," . intval($item);
}
}
}
}
if (!in_array($category->id, $ids)) {
array_push($ids, $category->id);
if ($str_sort == "") {
$str_sort = $category->id;
} else {
$str_sort .= "," . $category->id;
}
}
$this->build_query($this->selected_lang->id, true);
$this->db->where_in('categories.id', $ids, FALSE);
if ($only_visible == true) {
$this->db->where('categories.visibility', 1);
}
$this->db->order_by('FIELD(id, ' . $str_sort . ')');
$result = $this->db->get('categories')->result();
$result_cache[$category->id] = $result;
set_cache_data($this, $key, $result_cache, "st");
return $result;
}
but the problem is currently I fetch with this code all categories without limit. How to get first 10 records?
I try:
$result = $this->db->get('categories', 10)->result();
But this not work and still fetch all categories. Can anyone help me resolve this issue? Maybe I do something wrong. Thanks for check.