模型的codeigniter全局数组

Question

In my controller I want to declare a global variable which will always fetch all areas from my db

currently I'm passing $data['dropdowns'] in all methods in my class

{
$data['dropdowns']=loading some other model method
$this->load->view('commons/header',$data);  
}

{
  $data['dropdowns']=loading some other model metod
$this->load->view('commons/header',$data);  
}

{
  $data['dropdowns']=loading some other model metod
$this->load->view('commons/header',$data);  
}

{
   $data['dropdowns']=loading some other model metod
$this->load->view('commons/header',$data);  
}

the thing is I want to now send $data['area'] to all the views without having to declare it again and again in each method

$data['area']= $this->area_model->get_all_locations();

Answer 1

You want to add global variable , but as per my suggest to use global function to use any where to using to send parameter, so please check below my code.
Note : please load your model in application/config/autoload.php file

This is simple demo : controller

{
 $data['dropdowns']=$this->your_model_name->get_records('table_name','select field like id, name');
 $this->load->view('commons/header',$data);  
}

{
 $data['dropdowns']=$this->your_model_name->get_records('table_name','select field like id, name,user_name');
 $this->load->view('commons/header',$data);  
}

Your model

function get_records($table_name,$field_name)
{
   $this->db->select("$field_name");
   $this->db->from("$table_name");
   $query=$this->db->get();

    return $query->result_array();

}

Answer 2

create a base_controller and placed in application/core

class base_controller extends CI_Controller
{
    public $area = array();
    function __construct()
    {
        // Call the Controller constructor
        parent::__construct();
        $this->get_area();
    }
    public function get_area() {
        $this->load->model('area_model');
        $this->area= $this->area_model->get_all_locations();
    }
}

now $this->area is available in all controller which extends base_controller and all common functionality you can put here

class homepage extends base_controller{
    function __construct()
    {
        // Call the Controller constructor
        parent::__construct();

    }
public function index()
    {
        $data = $this->area; // call this wherever u need
        $this->load->view('commons/header',$data);

    }

}

importantly $this->area; one can use directly inside view

Answer 3

Create a helper for your custom functions

Eg: custom_helper.php then load your custom helper in autoload.php

In custom_helper.php , create a function for getting area.

if (!function_exists('get_area')) {
    function get_area() {
        $CI = & get_instance(); 
        $area= $CI->area_model->get_all_locations();
        return $area;
    }
}

You can call get_area() in your views without declaring in controllers..