Trying to get property of non-object php variable - php

Question

I am using codeigniter and I have made a function to return name of the user. Here is the code:
$this->db->where('u_id', $id);
$query = $this->db->get('users');
$data = $query->result_array();
$string = $data->u_name.' '.$data->u_surname;
return $string;
When I am using this function i get this error:
Message: Trying to get property of non-object and recall the line with
$string = [...]

Answer 1

Use foreach loop:
foreach ($data as $row)
{
echo $string = $data['u_name'].' '.$data['u_surname'];
}

Answer 2

You can try like this.In codeigniter,The row() returns the matched first row according to your condition in object form.
$this->db->where('u_id', $id);
$query = $this->db->get('users');
$data = $query->row();//change here
$string = $data->u_name.' '.$data->u_surname;
//echo $string;
return $string;
for more see Codeigniter Result Sets

Answer 3

Try this code to return
$this->db->select('*');
$this->db->from('users');
$this->db->where(array('u_id'=>$id));
$query=$this->db->get();
if($query->num_rows()()>0)
{
$data = $query->result();
return $data->u_name.' '.$data->u_surname;
}

Answer 4

This is because the function you chose to generate results for you query.
$data = $query->result_array();
result_array() returns the results in an array even if you only had one result, so when you try to $data->u_name for instance, you have this error because the array does not have that property.
You can do a foreach on $data and perform your logic or use other methods to get the result from the query like $query->row_array();
Take a look on the codeigniter documentation: Generating Query Results