Codeigniter Model: How to use values from a query for further calculations? - arrays

Question

i have a function in a model with the following query, and i want to make some calculations with value1, value2 and value3 outside the query. how to get the values out of this result()?
function ($id,$username$) {
$this->db->select("id,value1,value2,value3,value4");
$this->db->from("table1");
$this->db->where("username=$username and id = $id");
$query=$this->get();
$result = $query->result();
$result['$testvalue'] = (value1 * value2/113) + value3;
return $result; }
can someone help? i already found out how to use values from a table, but not from a query!
ok now i know how to use row_array.
i call the row_array in the controller
$data = $this->model_testmodel->testfunction($id, $username);
...
$this->load->view('pages/view_test', $data);
now i wanna know how the view would look like.
i tried many different ways.
in the moment i am stuck with ...
<?php foreach $data as $value: ?>
<label>Value1:</label>
<input type="text" name="value1" value="<?php echo $value['value1']; ?>">
<label>Value2:</label>
<input type="text" name="value2" value="<?php echo $value['value2']; ?>">
...
<?php endforeach; ?>
but i get two errors:
Message: Undefined variable: data
Message: Invalid argument supplied for foreach()

Answer 1

Try this...
function ($id,$username)
{
$this->db->select("id,value1,value2,value3,value4");
$this->db->from("table1");
$this->db->where(array('id'=>$id,'username'=>$username));
$query=$this->db->get();
$result = $query->row();
$testvalue = (($result->value1 * $result->value2/113) + $result->value3);
//test here
echo $testvalue;
$res = array();
$res['testvalue'] = $testvalue;
$res['value1'] = $result->value1;
$res['value2'] = $result->value2;
$res['value3'] = $result->value3;
return $res;
}
It returns $res as array.Easy to execute of you got problem comment.. if it works accept.Lets enjoy..
Then make a function call and accept array in a variable..like this..
first load model then make function call.from your controller
$this->load->model('model_name');
$data= $this->model_name->function_name($id,$username);
//Fetch returned array like this..
echo $data['testvalue'];
echo $data['value1'];
//so on