Supprimer compte php BDD/mysql - Page 2

users 

<?php

ini_set("error_reporting", 1);
session_start(); 

// remplace les acces
$mysqli_connection = new MySQLi('localhost', 'user', 'pass', 'db');

//rapport
if($mysqli_connection->connect_error){
echo "Non connecte";
}
else{

//operation
$sql="Delete from users where username='".$_SESSION['username']."'";
$mysqli->query($sql) ? $message="supprime" : $message="non supprime";
echo $message;

}


?>