[eluser]CroNiX[/eluser]
Class variables, aka properties, are accessible only when using $this, as $this refers to the entire object, not the individual method. So you need to use $this to access individual class properties throughout the class.
Code:
class Someclass extends CI_Controller {
public $data; //class property declaration, only accessible by using $this->data
public __construct()
{
parent::__construct();
$this->data = 'my property data'; // populate property on construct
echo $this->data; // 'my property data'
}
function some_function()
{
$data = 'test'; //this is a local variable only available to this method, some_function().
$this->data = 'other data'; //this is setting the class property, $data
echo $data; // "test"
echo $this->data // "other data"
}
function another_function()
{
echo $this->data; // 'my property data'
echo $data; //this is undefined in this method as it is defined in some_function
}
}
In the above, when the class is instantiated, it sets the property, $data and echos it.
'my property data'
If you go to /someclass/some_function:
-goes through constructor first, sets property $data and echos it
-sets local variable $data, sets property $data and echoes them both
'my property data'
'test'
'other data'
If you go to /someclass/another_function
-goes through constructor first, sets property $data and echos it
-echos property $data, again
-produces error that variable $data is undefined as it's only available within some_function where it was declared as a local variable.
'my property data'
'my property data'
error, $data is undefined
Hope that helps a bit. There is a difference between class variables and local variables, and you have to access them as such.
