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Accessing CI object from Library

most of the times I see CI object is accessed from library in following way:

PHP Code:
$ci = &get_instance(); 

But in Codeigntier Ion Auth library they accessed as if they not in library.
Here is contructor of Ion Auth Library.
PHP Code:
    public function __construct()

How it is accessed using $this in this library?
The link to code: https://github.com/benedmunds/CodeIgnite...n_auth.php

It's using the php magic method __get()

PHP Code:
     * __get
     * Enables the use of CI super-global without having to define an extra variable.
     * I can't remember where I first saw this, so thank you if you are the original author. -Militis
     * @param    string $var
     * @return    mixed
public function __get($var)

Hope that helps.
What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )

never used magic methods. 
now I know thanks

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