Variable passed but exception still thrown? - php

Question

I create and pass a data array:
public function home()
{
$data['page'] = 'home';
$data['table'] = 'pageData';
$data['temp'] = 'temp_1';
$this->template($data);
}
public function template($data)
{
$this->load->model("model_get");
$data['results'] = $this->model_get->getData($data);
$this->load->view('template', $data);
}
This is the template view:
<?php
$this->load->view('header');
$this->load->view('nav', $data);
$data['results'] = $results;
$this->load->view($temp, $data);
$this->load->view('footer');
?>
It throws an exception for undefined variable at:
$this->load->view('nav', $data);
but still loads the view and completes all the if statements inside it and loads the view from the name stored in $temp.
Why does it throw the exception?

Answer 1

You haven't populated $data in that view to load a second view. Your code is too vaguely named to really understand what it's supposed to be doing but let's break it down.
public function home()
{
$data['page'] = 'home';
$data['table'] = 'pageData';
$data['temp'] = 'temp_1';
$this->template($data);
}
public function template($data)
{
$this->load->model("model_get");
$data['results'] = $this->model_get->getData($data);
//I assume getData takes a table name and returns all the data
//This only works because you're taking all the data passed from the first function
//in the function above.
$this->load->view('template', $data);
}
<?php
$this->load->view('header');
$this->load->view('nav', $data);
//At this point $data is empty. You have available $results, $page, $table and $temp
//because they were passed from the template function above.
$this->load->view('nav', $results);
//The line above is what it appears you need, rather than $data.
$data['results'] = $results;
//You've repopulated $data here but now all it contains is $results.
$this->load->view($temp, $data);
$this->load->view('footer');
?>
What you're misunderstanding is $data is not persistent, when you pass it to a view by loading a view with $data as the second parameter it breaks down into it's components, so $data itself is no longer available.