Undefined variable that is defined in the constructor

Question

Hi I seem to be getting an error on my code that seems to say that I have not initialez my variable but th veriabile is initialized in the constructor:

Notice: Undefined variable: conn in D:\Program Files\xampp\htdocs\Tutorials\Login\classes\mysql.php on line 18

Fatal error: Cannot access empty property in D:\Program Files\xampp\htdocs\Tutorials\Login\classes\mysql.php on line 18

And this is my code:

<?php
require_once('includes/constants.php');
    class Mysql{

        private $conn;

        function __construct() {
            $this->conn = new mysqli(DB_SERVER , DB_USER , DB_PASSWORD , DB_NAME) or 
                   die('There was a problem connecting to the database');
        }
        function verify_Username_and_Pass($un , $pwd){

            $query = "SELECT * 
                      FROM users
                      WHERE username = ? AND password= ?
                      LIMIT 1";

            if($stmt = $this->$conn->prepare($query)){ //this is where the error points
                $stmt->bind_param('ss', $un, $pwd);
                $stmt->execute();

                if($stmt->fetch()){
                    $stmt->close;
                    return true;
                }
            }   
        }
    }
?>

The error is thrown at the first if statement.How can I solve it?

Denys Séguret · Accepted Answer · 2012-10-24 15:07:34Z

3

Replace

$this->$conn

with

$this->conn

on the line when you have the error.

answered Oct 24, 2012 at 15:07

Denys Séguret

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Comments

Bogdan · Accepted Answer · 2012-10-24 15:07:46Z

2

$this->$conn

This is wrong, it should be

$this->conn

answered Oct 24, 2012 at 15:07

Bogdan

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