Codeigniter - Best Place to Declare Global Variable

CodeIgniter - best place to declare global variable

There is a file in /application/config called constants.php

I normally put all mine in there with a comment to easily see where they are:

/**
 * Custom defines
 */
define('blah', 'hello mum!');
$myglobalvar = 'hey there';

After your index.php is loaded, it loads the /core/CodeIgniter.php file, which then in turn loads the common functions file /core/Common.php and then /application/constants.php so in the chain of things it's the forth file to be loaded.

How to use global variable in PHP Codeigniter

Don't use GLOBALS you can just use a private variable in your class.

• Create the variable above your __construct function like private $er
• In your __contruct function set the default value
• Set and get in your public function using $this->er

Implemented in your code:

class Login extends CI_Controller {

    private $er;

    public function __construct() {
        parent::__construct();
        $this->er = FALSE;
    }

    public function index() {
        $data['er']= $this->er;
        $data['main_content'] = 'login_form';
        $this->load->view('includes/template', $data);
    }

    public function validate_credentials() {
        $this->load->model('user_model');
        $query = $this->user_model->validate();
        if ($query) {
            $data = array(
                'username' => $this->input->post('username'),
            );
            $this->session->set_userdata($data);
            redirect('pmpBulletin/members_area');
            //die(here);
        } else {
            $this->er = TRUE;
            $this->index();
        }
    }
} 

CodeIgniter - best place to declare global variable

There is a file in /application/config called constants.php

I normally put all mine in there with a comment to easily see where they are:

/**
 * Custom defines
 */
define('blah', 'hello mum!');
$myglobalvar = 'hey there';

After your index.php is loaded, it loads the /core/CodeIgniter.php file, which then in turn loads the common functions file /core/Common.php and then /application/constants.php so in the chain of things it's the forth file to be loaded.

how to define Global variable in codeigniter?

file location - Application -> Config -> constants.php here you can define global variable

define('BASE_PATH',"/home/example/public_html/");
define('UPLOAD_PATH',BASE_PATH . 'uploads/');

//this is your global variable, can use anywhere in application
   echo $UPLOAD_PATH;

How to define a global variable(value) in codeIgniter

Create A core controller, since your process requires logical operations then you need a method for that.

application/core/MY_Controller.php

class MY_Controller Extends CI_Controller
{

   protected $default_theme = 'theme';

   public function __construct()
   {
      parent::__construct();
   }

   public function get_theme()
   {
         //your code for selecting the current theme selected from
         //the database
         $theme_from_db = '';

         return $theme_from_db == NULL ? $this->default_theme : $theme_from_db;
   }
}

Your Controller must extend MY_Controller

application/controller/view.php

class view extends MY_Controller
{
   public function index()
   {
     $this->load->view($this->get_theme().'result', $data);
   }
}

Codeigniter global variable in view

I noticed that you can access variables in views without passing them if you declare them in the controller with $this->. Probably because they default to public visibility.

 public function __construct() {
   parent::__construct();
   // $data['count_student'] = $this->m_data->allStudent(); // count all students
   // 
   $this->count_all_the_students = $this->m_data->allStudents();

 }

 public function index() {
   $data['content'] = 'view-students';
   $this->load->view('frontend/header' , $data);
 }

And then in the view you can use $this->count_all_the_students without putting it in the $data array.

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

 <?php 
   echo 'I have misled ' . $this->count_all_the_students . ' students with my MVC breaking suggestions.';

In CodeIgniter, where should I declare my global variables?

You may utilise config file (system/application/config/config.php) to set configuration related variables.

Or use constant file (system/application/config/constants.php) to store site preference constants.

How to declare global variables in php codeigniter 3.1.9?

You can add your Global Variables in Constant File

File PATH: \application\config\constants.php

Or

You can add your Global Variables in Config File

File PATH: \application\config\config.php

define('ThemeColor', 'blue');//key and value

Now ThemeColor is your global variable you can use it in entire MVC pages, No need to write '$' before variable just use it as you wrote in define

Codeigniter create and access global variable

If your intention is to provide a default \description of how to handle the calculation then what you have done is perfectly acceptable. I would suggest you access the variable in this way.

$calc_method = $this->config->item('expenses_calculation');

The advantage to this is that item('expenses_calculation') will return NULL if the item doesn't exist.

But if $this->config->config['expenses_calculation']; doesn't exist an "Undefined index" PHP error will be thrown.

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