extends MY_Model call twice the __contruct

extends MY_Model call twice the __contruct - Printable Version

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extends MY_Model call twice the __contruct - El Forum - 08-09-2013

[eluser]Unknown[/eluser]
I have a problem when i try to extends my_model it's call twice the first time is called without parameters, here is the code

MY_Model

Code:
class MY_Model extends CI_Model{

 public $multiple_array=array();

 public $multiple_key=false;

 function __construct($tabla='',$id='') {

        parent::__construct();

       $this->load->database();//carga las librerias para manejar db

        $this->tabla=$tabla;

 $this->id=$id;

 echo "example";  

 }

    }

and Prueba_mod

Code:
class Prueba_mod extends MY_Model{

 function __construct(){

  parent::__construct("carrera");

  //echo "asdas";

 }

}

The echo in the file MY_Model.php will echo twice "example" and if i extends CI_Model it will echo once example.
i would like to understand this behaviour and control it to extends MY_Model and just call once the constructor