Create Simple Codeigniter library

Question

For my current project i decided to create a library for some common functionalities.

Ex : Login_check,get_current_user etc.

With my little knowledge i created a simple one but unfortunately its not working.

Here my library :

FileName : Pro.php and located in application/libraries

class Pro{

    public function __construct()
    {

       parent::_construct();
        $CI =& get_instance();
       $CI->load->helper('url');
       $CI->load->library('session');
       $CI->load->database();
    }

    function show_hello_world()
    {
        $text = "Hello World";
        return $text;
    }
}

?> 

And i tried to load it on my controller :

<?php
class Admin extends CI_Controller
{
    function __construct()
    {     
        parent::__construct();
        $this->load->database();
        $this->load->library(array('session'));
        $this->load->library("Pro");
    }
    function index()
    {
        echo($this->Pro->show_hello_world());
    }
}

?>

I cant see any erros there...but i am getting a blank page.

Whats wrong with me ??

Thank you .

Edit : I got this error :

Call to a member function show_hello_world() on a non-object in C:\wamp\www\Project\application\controllers\admin.php on line 13

Answer 1

One thing I notice: remove the parent::__construct() from your library constructor, because it's not extending anything so has no parent to call.

Also, enable error reporting by setting the environment to "development" in index.php, and you might also want to raise the logging threshold to 4 in config/config.php so you log errors.

Try this simple test-case:

file Pro.php in application/libraries:

class Pro {

  function show_hello_world()
  {
    return 'Hello World';
  }
}

Controller admin.php in application/controllers

class Admin extends CI_Controller
{
    function index()
    {
        $this->load->library('pro');
        echo $this->pro->show_hello_world();
    }
}