Getting Null Value when passing variables from controller to model in codeigniter

Question

I am having some problem. I am trying to pass a variable from a controller to a model, but I always get a NULL value ON THE MODEL. Anyone can point out what is wrong with my code?

CONTROLLER

public function test()
{
    $this->load->model('model_register');

    //ID Creation to be inserted into the database
    $country_prefix = $this->model_register->countryprefix();
    $org_prefix = $this->model_register->organizationprefix();
    $insertion = $this->model_register->insertion();

    $userid_base = $country_prefix['0']['c_code'].$org_prefix['0']['id'];

    $basenum = "000000000";
    $base_length = strlen($basenum);
    $id_length = strlen($org_prefix['0']['id']);

    $computation = $base_length - $id_length;

    $id_base_array = array();

    for ($i = 0; $i < $computation; $i++)
    {
        array_push($id_base_array, "0");
    }

    $id_base = implode("",$id_base_array);

    $userid_admin = $country_prefix['0']['c_code']."ADM".$id_base.$org_prefix['0']['id'];

    //Insert Data

    //data-mix
    $data['userid'] = $userid_base;
    $data['baselength'] = strlen($basenum);
    $data['id_length'] = strlen($org_prefix['0']['id']);
    $data['result'] = $computation;
    $data['id_base'] = implode("",$id_base_array);
    $data['userid_admin'] = $userid_admin;
    $data['insertion'] = $insertion;

    $insertion = $this->model_register->insertion($data['userid_admin']);

}

Model

public function insertion($x)
{
    $value = $x;

    $data = array(
        'testid' => $value,
    );

    $this->db->insert('test',$data);

    return $value;
}

When I run this, I get

INSERT INTO `test` (`testid`) VALUES (NULL)

Answer 1

You called insertion twice with two different 'arguments'. The first one $insertion = $this->model_register->insertion(); was called without parameters and the second was called with parameters, $insertion = $this->model_register->insertion($data['userid_admin']);

This condition may fall under Method Overloading , a condition where the same method is created but with different parameters and as such can perform two different functionalities.

If you want to use the same function in both cases, however the best fix is to pass a default NULL value as the parameter in the Model file, like this

public function insertion($x = NULL) {
    // Function code appears here
}