PDO(?) — :variable

Question

I found this code. How is it possible to use a variable (the delete command), before defining it? My understanding, at least - is that this sets :id to the value of $id.

    $this->db->query('DELETE FROM sessions WHERE id = :id');
    $this->db->bind(':id', $id);

Answer 1

Here, :id is not a variable, it's a named placeholder.

In the second statement, you just tell PDO to bind the value of $id with the :id placeholder.

See the documentation .

Answer 2

You have to use prepare . Query makes only a query. So you have to prepare it first.

$stmt = $db->prepare("DELETE FROM sessions WHERE id = ?");
$stmt->execute(array('red'));

Something like that.