Question

Hi I just finished reading a beginner book on PHP and I wana start to create my own login.I did not get very far and I got an error that I can;t seem to fix.

I have 3 files

    index.php

    session_start();
    require 'DB_ACCES/connect.php';

    if(isset($_POST['submit'])){
        $conn = new Mysqli();
    }

    constants.php

    define('DB_HOST', 'localhost');
    define('DB_USER' , 'root');
    define('DB_PWD' , '');

    connect.php

    require '../includes/constants.php';

    class Mysqli{

        private $conn;

        function __construct() {
            $this->conn = new mysqli(DB_HOST , DB_USER , DB_PWD) or die(mysqli_error());
        }
    }

When I run index.php I get this error:

Fatal error: Cannot redeclare class Mysqli in D:\Program Files\xampp\htdocs\MyWork\Blog\DB_ACCES\connect.php on line 4

What am I doing wrong here and how can I repair it?

Answer 1

The bug is exactly what the error states.

Mysqli is an existing class that’s part of a very common php shared library mysqli. You can’t redeclare it.

Change your classname to MyMysqli or something.

class MyMysqli{

    private $conn;

    function __construct() {
        $this->conn = new mysqli(DB_HOST , DB_USER , DB_PWD) or die(mysqli_error());
    }
}