Syntax in function does not work

You have called the row() method wrong, try this:

PHP Code:

function test() {
  $test = $this->db->query("SELECT name FROM users");
  $name = $test->row()->name;s e
  return $name;
} 


I apologise, I thought it correct, I wrote wrong.
This example does not work:

function test() {
$test = $this->db->query("SELECT name FROM users");
$name = $test->row()->name;
return $name;
}

echo test();

The error is same:

Fatal error: Using $this when not in object context in /folder/with/my/project/admin.php on line 248