Passing parameters when initializing a library in Codeigniter

Question

I am really new to Codeigniter, and just learning from scratch. In the CI docs it says:

$params = array('type' => 'large', 'color' => 'red');
$this->load->library('Someclass', $params);

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Someclass {

    public function __construct($params)
    {
        // Do something with $params
    }
}

Can you give me simple example how to pass data from controller to external library using array as parameters? I'd like to see a simple example.

And the example is in your question ..$params = array('type' => 'large', 'color' => 'red'); $this->load->library('Someclass', $params); does it — Bhuvan Rikka
– Bhuvan Rikka, Commented Oct 18, 2012 at 11:12
@BhuvanRikka: I don't agree with or understand your first comment, can you clarify? Why shouldn't you pass parameters to the constructor? — No Results Found
– No Results Found, Commented Oct 18, 2012 at 11:21
@WesleyMurch We cannot access constructor directly,right! Like,passing parameters into it from a uri. I never tried it though. And i've never seen anyone doing so. I may be completely wrong. The moment i saw it in the OPs question made me feel like that. can we do it? Please explain & sorry for my bizzare comment — Bhuvan Rikka
– Bhuvan Rikka, Commented Oct 18, 2012 at 11:30
CI libraries are just PHP classes, you can do anything you want with them, including calling __construct manually. I can't understand your question at all, of course you can pass in arguments to the constructor. — No Results Found
– No Results Found, Commented Oct 18, 2012 at 11:32
@WesleyMurch TFYI. I was seeing it as a method which can't be called from a uri. I forgot the basic thing that it can be called manually inside the constructor :O — Bhuvan Rikka
– Bhuvan Rikka, Commented Oct 18, 2012 at 11:37

No Results Found · Accepted Answer · 2012-10-18 11:34:26Z

All Codeigniter "library" constructors expect a single argument: an array of parameters, which are usually passed while loading the class with CI's loader, as in your example:

$params = array('type' => 'large', 'color' => 'red');
$this->load->library('Someclass', $params);

I'm guessing you're confused about the "Do something with $params" part. It's not necessary to pass in any params, but if you do you might use them like this:

class Someclass {
    public $color = 'blue'; //default color
    public $size = 'small'; //default size
    public function __construct($params)
    {
        foreach ($params as $property => $value)
        {
            $this->$property = $value;
        }
        // Size is now "large", color is "red"
    }
}

You can always re-initialize later like so, if you need to:

$this->load->library('Someclass');
$this->Someclass->__construct($params);

Another thing to note is that if you have a config file that matches the name of your class, that configuration will be loaded automatically. So for example, if you have the file application/config/someclass.php:

$config['size'] = 'medium';
$config['color'] = 'green';
// etc.

This config will be automatically passed to the class constructor of "someclass" when it is loaded.

mrsrinivas · Accepted Answer · 2012-10-18 11:18:04Z

2

In libraries directory create one file Someclass_lib.php

Here is your Library code

if (!defined('BASEPATH')) exit('No direct script access allowed');

class Someclass_lib
{
    public  $type       =   '';
    public  $color      =   '';

    function Someclass_lib($params)
    {
        $this->CI   =&  get_instance();
        $this->type =   $params['type'];
        $this->color    =   $params['color'];
    }
}

Use this code when you want to load library

$params = array('type' => 'large', 'color' => 'red'); 
$this->load->library('Someclass_lib', $params);

answered Oct 18, 2012 at 11:18

mrsrinivas

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