试图获取非对象php变量的属性

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