将值从控制器传递到视图

Question

I have a query in my model using joins and returned the query results as array

result_array();

I then returned that result to my controller where i called the model.

$data = $this->Model->show();

        foreach($data as $val)
        {
        $arr[$val['recipename']] = $val['componentname'];
        }

        if($data != null)
        {
        $this->load->view('Admin\success',$arr);
        }

I didnt originally had $arr value. I just added it up there to make the array clearer. Anyhow, with or without.

var_dump($data) and var_dump($arr) or even if i $recipename or $componentname stll null.

returns null. says they are undefined.

I don't know what went wrong.

I read this other question. that is why i made the $arr so i could make it a single array and so when it transfers it will be extracted and tried to echo them but to no avail.

Codeigniter passing data from controller to view

EDIT:

query works fine, it returns values.

$sample = $this->db->select('recipe.recipename,component.componentname')->from('recipe')
               ->join('recipecomponent','recipe.recipeid = recipecomponent.recipeid')
               ->join('component','component.componentid = recipecomponent.componentid')
               ->group_by('recipe.recipeid')
               ->get()
               ->result_array();

                return $sample;

Answer 1

$data is most likely empty and you are iterating an empty array.

A simple way to debug is found below:

Debugging an array or object:

echo '<div style="padding:15px; background-color:white;"><pre>'.print_r($data, true).'</pre></div>';

or

echo '<div style="padding:15px; background-color:white;"><pre>'.print_r($this->Model->show(), true).'</pre></div>';

You should also turn on error reporting in your __construct like so:

error_reporting(E_ALL);

If the print_r() shows you an empty array then your model is returning no data and the answer to your question is probably that you need to fix your query.

Answer 2

Once you pass an array of data to your view the array keys are turned into variables . Say for example after your foreach loop your $arr variable is an array like this

array [
    'cheese' => 'brie'
    'cookie' => 'chocolate chips'
]

You would then access $arr['cheese'] by doing the following in the view

echo $cheese;

Trying to access $data or $arr in the view won't work because they are not in scope