在CodeIgniter中加载多个库 - PHP

Question

I need to load more than 2 libraries in a CI Controller and call their member functions. I've tried the following ways but no use.

1.

    $this->load->library('liba');
    $result = $this->liba->SearchTours($searchParams);
    echo $result;

    $this->load->library('libb');
    $result2 = $this->libb->tourFetch($searchParams);
    echo $result2;

2.

    $this->load->library(array('liba' , 'libb'));

    $result = $this->liba->SearchTours($searchParams);
    echo $result;
    $result2 = $this->libb->tourFetch($searchParams);
    echo $result2;

3.

    $this->load->library('liba');
    $this->load->library('libb');

    $result = $this->liba->SearchTours($searchParams);
    echo $result;
    $result2 = $this->libb->tourFetch($searchParams);
    echo $result2;

4.

    public function __construct(){
      parent::__construct();
      $this->load->library('liba');
      $this->load->library('libb');
    }

5. I have swapped the order of loading in above 4 cases. Whichever is mentioned second does not load.

In all the cases only the first mentioned library is loaded and this Notice shows for the second one.

A PHP Error was encountered Severity: Notice Message: Undefined property: Unify::$libb Filename: controllers/Unify.php Line Number: 30

I couldn't find any soultion on CI user manual or SO. What am I doing wrong?

Answer 1

load multiple library in CI Just pass in it array

$this->load->library( array('liba', 'libb') );

and this notice because you not include

$CI =& get_instance(); 

inside your controller

Answer 2

Is the file in your controllers folder. If yes then You might not have properly extended your controller. Like:

myController extends CI_Controller{}

else You need to use $CI =& get_instance(); inside your file and then use

$CI->load->library('your_library');

Edit: NOTE: Check if your library file is capitalized inoyur folder structure like Libb.php

Answer 3

whenever you use libraries and helpers and need a built-in method from CI , use

$CI =& get_instance();

and then use it like so

$CI->load->helper('url');
$CI->load->library('session'); 
$CI->config->item('base_url');  //...etc

see codeigniter.com/userguide2/general/creating_libraries.html for more info

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or for a better solution, you can use codeigniter + HMVC to be able to call a controller from another and avoid any conflicts and ease your troubleshooting see

MVC vs HMVC for web application development

Cheers !