how to access the array inside the array in codeigniter?

Question

I am new to CI . I had a function to access a list of data as category. The function was like this:

      public function get_category_tree()
{
    $this->ci->db->where('is_display','1');
    $query = $this->ci->db->get('product_categories');

    if ($query->num_rows() > 0) 
    {

        foreach($query->result() as $cat)
        {
            if($cat->parent_id=='0'){
                //category
                $categories_arr[$cat->id] = array('id' => $cat->id, 'parent_id'=>$cat->parent_id ,'name' => $cat->name, 'subcat' => '');
            }else{
                //subcategory;
                $categories_arr[$cat->parent_id]['subcat'][] = array('id' => $cat->id, 'parent_id' => $cat->parent_id, 'name' => $cat->name);
            }
        }
        return $categories_arr;
    }               
    return false;
}

this function was defined in general library and i accessed it from the controller like this:

    $this->data['category_tree'] = $this->general->get_category_tree();

And this used to give me this result:

Now i upgraded my php to 7+, now the line

    $categories_arr[$cat->parent_id]['subcat'][] = array('id' => $cat->id, 'parent_id' => $cat->parent_id, 'name' => $cat->name);

did not work and gave php error and i simply removed the [] and it became

     $categories_arr[$cat->parent_id]['subcat'] = array('id' => $cat->id, 'parent_id' => $cat->parent_id, 'name' => $cat->name);

Now when i print_it it gives me this result:

    Array
   (
  [id] => 19
  [parent_id] => 0
  [name] => DVDs & Movies
  [subcat] => 
   )
   Array
  (
  [id] => 32
  [parent_id] => 0
 [name] => Stamps
[subcat] => Array
    (
        [id] => 90
        [parent_id] => 32
        [name] => Worldwide
    )

  )

Only the last array of the sub array. How can i solve it. I searched a lot about the upgrade and fix for it but couldn't garb anything useful. Can anyone please help. Thanks in advance

@JYoThI Fatal error: Uncaught Error: [] operator not supported for strings in E:\xampp\htdocs\tshirt_design\application\libraries\general.php:209 Stack trace: #0 — TShrestha
– TShrestha, Commented Jun 14, 2017 at 9:38
you defined subcat as string . so now your using array syntax on string so .it will give this error so . define the subcat as array . as @Mohmad mentioned below . — JYoThI
– JYoThI, Commented Jun 14, 2017 at 9:47

Mohammad Hamedani · Accepted Answer · 2017-06-14 09:39:30Z

2

Because you define subcat as string by 'subcat' => '' in defining $categories_arr[$cat->id]. Use this:

public function get_category_tree()
{
    $this->ci->db->where('is_display','1');
    $query = $this->ci->db->get('product_categories');

    if ($query->num_rows() > 0) 
    {

        foreach($query->result() as $cat)
        {
            if($cat->parent_id=='0'){
                //category
                $categories_arr[$cat->id] = array('id' => $cat->id, 'parent_id'=>$cat->parent_id ,'name' => $cat->name, 'subcat' => array());
            }else{
                //subcategory;
                $categories_arr[$cat->parent_id]['subcat'][] = array('id' => $cat->id, 'parent_id' => $cat->parent_id, 'name' => $cat->name);
            }
        }
        return $categories_arr;
    }               
    return false;
}

answered Jun 14, 2017 at 9:39

Mohammad Hamedani

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6 Comments

TShrestha Over a year ago

WOW!! that worked but how can i check if the $category['subcat'] array is empty

Mohammad Hamedani Over a year ago

You can use if(!$category['subcat']) or if(empty($category['subcat'])) to check array is empty.

TShrestha Over a year ago

okay . Can you please tell me what is $categories_arr[$cat->id] and $categories_arr[$cat->parent_id] ?

TShrestha Over a year ago

is that defining array?

Mohammad Hamedani Over a year ago

$categories_arr[$cat->id] = define value of $categories_arr array element that has $cat->id index. So if not exists, create it and if exists, overwrite it.

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